400 B block

Not to steal a thread here but isn't the 72 '230' 400 block the "One To Have" ?

It is IF it sonic checks OK , as is the case with ANY block you build , I have a 230 block and it needs 3 sleeves because of core shift and 2 more from rust pitting .

As far as the early vs. late block horsehockey that's been floating around that has been disproved years ago, actually the later blocks have been found to have THICKER cylinders and BETTER core consistency than the earlier blocks , the big difference is they are a little softer on the hardness scale , which depending on who you talk to is an advantage ...

To the OP have the block cleaned and sonic checked FIRST to determine how large a bore the block will accept and go from there , remember that thicker cylinder walls stay rounder under high loading better , only bore it as big as you need . I am with moper on a cube limit especially if it's going to see lots of street duty , short pistons are not very street friendly on a longevity standpoint.