opinions welcome on build.

I think most people especially ones who are mainly street don't want to gear more than 3.55 and want 450-550 hp should go 408 or to me big block.
But if your willing to gear it love rpm and a race car idle no reason why you can't just spin a stock stroke up to those power levels.
Really just depends on the person and situation. I'd rather gear and spin it but that's me plus I do believe there is an advantage with 3.31/3.58 strokes biggest I'd go is 3.79.