the turbo I have is a garrett GTA42, 74.5 mm turbo. Not to sure how much boost it will put out, but it is brand new and never been used. it is an internal wastegate setup. Was going to put it on my sbc but I know over 8 lbs boost will kill it. the 454 is already .30 over, been told that takes it up to a 468. it has stock reworked oval port heads, 615/636 lift cam, 296/304 duration. I think the turbo on it would scream. Any thoughts?