I got a solution for the next go fast V-20

[RidgeRunner]

My only concern using the SB400 is the effect of salt water in and around the siamesed area of the block.. Then what heads/piston combo? Are you gonna try and stuff a long rod in or go back stock? Don't forget the steam holes, there won't be any in a new set of heads.

[UBHSTRY]

Ridge, staying freshwater :) Going to use a set of performer 90909 rpm heads. Keeping the block stock for this, I think iirc, they are 5.65 rods in a stock 400.

[RidgeRunner]

Yes sir I think you recall correctly. Getting a 6" rod in there can be tricky when ordering pistons. Stock the 400 had a small dish piston and open chamber heads. Mostly truck engines. Some like the stroker, I liked the cubes. I turned the 400 just as hard.