We had a set of those old roundy round "Pontiac" heads that had been worked over pretty good on a 434" sb chevy years ago. Made right at 700 hp and ran real good. It picked up some power when we switched to some out of the box AFR 227 CNC heads though.

CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax