383 or 400 ?

moper said

The only way a 440 piston can be used in a 400 is if you put the same stroke crank in it too. Hence the 451, 470, 496, 505 deals that use the same pistons rods and strokes.
If it was me I'd run the 383 and either keep or sell the 400 on. The 400s worth something - the 383 isn't.

Click to expand...

69conv and I have mentioned how a 440 piston in a 400 is possible. A .060 over 72-78 type replacement 440 piston in a .040 over 400 block. At one time it was a fairly economical way to raise compression in a 400 back before the KB hypers were available. I would get both engines, use the 383, and save your pennies to build a stroked 400 based engine later.