yes
Yes.
yes but it has to be 83 or newer
No. The 400 is externally balanced and requires it's own flywheel.
No. Standard 350 engines have 4.00" pistons, standard 400 pistons are 4.125".
It should work well.
its about 350
.030
The main journals need to be turned down.
377
no you cannot. most engines .06 overbore is usually the safe limit. on a 350 .06 only gives you 10 more cubic inch. to get to 400 you would need to bore and stroke it. which gets very expensive. youd be better off looking for a 400 from a donor vehicle.
To build a 383 sbc (small block Chevy) a 3.75 inch stroke 400 sbc crank is added to a .030 inch overbored 350 sbc. This combination has never been released by Chevrolet in a production vehicle . So the answer to your question is no .