[Palf70Step]

They swap out fairly easy. I put my 70's 350 into my 83.
Distributor swap, no issue at all.
Flexplate & all - the same.
Carbs I am not sure...they should be interchangeable. I had an aftermarket manifold & carb on mine.

Only thing I found as an issue is the dip stick. 83 was on passenger side, 70 on driver's side, thus I could not use the stock exhaust manifold. I used some shorty headers on mine. I am told if your older engine has RAM horn manifolds they will clear, but you'll have to redo the exhaust pipes.

The water temp sender is not that same either between the engines. Smaller diameter hole on the new engine head and the older sending unit will not work the newer gauge.