Indy Cylinder head 408 Crate motor

375hp from a 408 is very low IMO.MadDart has a 318(stroked to 402)making over 500hp.I also have a 408 making over 500hp.Ofcourse this cost over the $4000 these engines cost.Your best bet is to buy a stroker kit,some RHS heads,use your 360LA block and have a respected engine builder assemble for you.It may cost more cash,but the outcome will surpass any crate engine.This is just my opinion,from experience and reading.Good luck.