400 usually gets a pass, if it is to be stroked, If I was to build a B engine I would drop a 3.75" crank into it even the 361 mentioned earlier would be a 406, even a .030" 383 would be a 431, but saying that nothing wrong with stock stroke.
That thought has actually crossed my mind for the 361. Did you know Oldsmobile 455 pistons would give 0 deck in that combo?
Following along on RRR's post 361's are actually 4.125 bore.
