451 > 440
He specifically said strokers were out of it in the original post.
451 > 440
my question to you the masses is whether there is a benefit or hinderance to choosing a 400 over a 440 or a 440 over a 400. I'm planning on ordering a 440 source stroker kit in either case
I think you didn't read the OP's post. See above. Ordering a kit either way. The 400 block is proven to be stronger. Period.