EFI change over from carb
Looking for any on suggestions on Installing EFI on my 1969 Mach 1
Looking at the Holley Sniper EFI set up
I have no experience with the Holley Sniper kits, but I do have an Edelbrock E-Street that I'm about 20% into an installation... and have been for years.

You kind of need to make some decisions regarding what you want the end result to be.  I'm after a Day Two restomod look for mine, which the factory style Ram Air air cleaner will pretty much hide the EFI unit, but I still have things like chrome valve covers, yellow Accel spark plug wires, and all sorts of underhood goodies that would've been found back in the day.

OK - so why isn't mine installed yet?  I spec'd out the kit in 2011 when they were first introduced/advertised, purchased in 2014, and have still yet to install.  I have, however, gotten the O2 sensor bung welded into the collector just downstream of the passenger side header collector.  Once I got the car running to the point of being registered and tagged, I've been driving it on the weekends, more than actually working on it.  Out here in West Texas, the weather is a big factor in determining the day's activities - it's usually too hot to do anything outside for me (I work in a data center, where it's almost always in the 60s thanks to all the HVAC needed to keep the racks cool).  I guess I'm just lazy since everything's running well for now.

In preparation for the eventual EFI, I installed an electric inline fuel pump with pre-filter (which actually is a Holley) in my driver side rear wheel well (between the frame and inner wheelhouse), and subsequently omitted the eccentric fuel pump pulley from the time gear and installed a Mr. Gasket block-off plate for the factory mechanical fuel pump location.  I also made sure to get the intake manifold, carb, and distributor to ensure a factory Ram Air air cleaner would still fit without issues.  The Edelbrock Performer 1406 is the same height as the Autolite 2100 2bbl carb that came from the factory, along with the Performer 351C-2V intake manifold is the same height as the factory 351C-2V intake.  I also wired my car up with a second circuit breaker coming off the battery, which supplies power to a pair of 6-circuit fuse blocks (one is always hot, the other is activated by a 'keyed power' circuit, so it only comes on when the car is in 'On' or 'Start' mode.

I opted for a 'returnless' system, so I wouldn't have to re-plumb the line back to the tank, but it does require a hi-pressure pump/tank to feed the EFI unit - that device will live in the space where the windshield washer 'bottle' currently resides, and I'll switch to a smaller (obviously non-factory style) washer bottle when the time comes.

So basically, you'll need the following, at the least:
  • an electric fuel pump to serve as a 'lift' pump to feed the EFI unit
  • convert all flexible fuel hoses to modern fuel injection rated fuel hoses
  • have a dedicated circuit (with its own fuse) for the EFI, ECU, and lift pump
  • weld an O2 sensor somewhere on the exhaust (sensor and bung should come with the EFI kit)
  • find a safe, non overheated place to the mount the ECU (on the firewall near the exhaust manifolds is probably not the best idea)
  • make sure everything fits under the hood
Hope this helps!
I don't have any experience with aftermarket EFI.  But I am partial to Holley.  They have been in the fuel system game for a long time.  One issue you will come across if your Mach 1 has an automatic transmission is the kick-down rod to the transmission from the carb (EFI throttle body in this case).  The only aftermarket EFI I have seen that has the correct Ford throttle linkage to attach the kick-down rod to an automatic transmission is the older Holler Terminator EFI setup.  If that's not an issue on your car then I think installing a good fuel pump is the most difficult part.  An in-tank fuel pump with a return line seems to be the most quite and most reliable setup. I think Holley now offers a complete fuel tank with fuel sender and internal pump for these cars.  Which makes it easier if that's in your budget.

Might I ask, why the conversion to EFI?  Cold starts might be better.  But if the carb is tuned correctly, the power increase will be minimal, and likely not even noticeable.

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