Blow by / Exhaust smoke

[noroz]

In your post, you mentioned driving 500 miles since the last owner.. Is that since the engine was rebuilt? If that is the case, the rings have or were not seated properly and it will have blow by. Perform a compression test on all cylinders after making the fuel issue repairs..
Hope this helps..

This has been on my mind a bit too, though I dont recall it blowing smoke before storage, I will run a compression test as soon as ive finished with this other stuff.

Back again,
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Well Ive done what I can so far, compression tests at 165 to 170 on all cylinders, new pcv, fuel pump, holley pain in the butt 670, reset float levels vac tested over 15 hg when tuning air/fuel this being with a
lumpy comp cam. I could keep mucking around with this, but Im seeing alot of stupid oversites from the guy who built this engine wrong length valves for the comp cams magnum valve tips causing wear on the retainers, which I am just using valve lash caps to stop further damage.
The weather is less humid now and the smoke can now be seen to be more of a light blue/ grey , which gets worse as the car gets to operating temp. Begining to look a bit more like poor ring seating or fuel wash in the bores? I might have to pull her down.