Originally posted by 86Diablo
umm, if you already have a 400 block, why not just get a 400 crank and get some more CI?
Thanks, I must have been asleep at the wheel not to realize that he said he has a 400 block

A 383 is built with a 350 block and 400 crank.

A 377 is built with a 400 block and 350 crank.

Put the 400 crank in it, bore it 0.030" and you have a 406.