15 lbs of boost supercharged 440. You didn't say, but I'll assume approaching600 hp was projected/expected.
You admit, he had some inconsistant stuff he threw money at; polished counterweight vs true decking and align honing. On a 15 lbs boosted motor. ](*,) I guess he didn't "get what he payed for" with that polished crank.
Best machine work is not going to fix that. I'm sure that contributed to his issues too.
OP was talking a naturally aspirated motor that will make a little more than one HP per cubic inch.