Can't decide on heads. . opinions??

500hp takes a good head, or a lot of cam and a decent head. I'm still staying away from Airwolf. When I see more in use and comparables I'll reconsider. the RPMs with some port work, the Indy 360-1s, W2s, will all make that power on the right shortblock. Like wa ssaid - pick your poison and pay and you should be good.