WOW that car looks great.
I bought the same colored (70) Mach 1 a few years ago.
I saw your 68 front turn signal lenses installed and it looks great.
The engine does look small in that engine bay. But Id just drive it that way for a while till you get another beefed up and ready to stab in there. Overall I think that it is alot better than the one I got.
The tilt steering columns go for about 400 bucks in an unrestored condition from Colorado Mustang. They are alot of work to restore and not cheap, but I do have a contact of a guy out in California who did mine and its great. I bought the new turn signal switch and mailed him all the stuff. As I remember it was about 450 bucks or so a couple years ago for the refurbishment. I also had to order special Black metallic interior (Mach 1) paint from Ohio Mustang to correctly match the color.
Rim Blow steering wheels go fro about 1,100 to 1,200 bucks for a really good restoration on a steering wheel. The run of the mill back yard restorations go for about $500 bucks on e-bay but trust me they look horrible and the wood grain doesnt match at all.... I did one myself at the tune of about 40 hours of my own labor and Ill never do it again. The original rim blow steering wheel makes those cars in my humble opinion. I finally found a ginger wheel that is in perfect original uncracked condition for $550 dollars plus shipping. I still have to send it off to get it restored and the color changed unless someone has a black one they want to trade in the same condition.
Soon you will get tired of a hot interior and decide to go with A/C.
I did it and love it.
Your car will stand out like a torch for all car enthusiasts to come see with that bright yellow color.
Congrats man its awesome to say the least.