Ported t/a - aar heads HP? For an old 340 sprint car

273 said
Stock 400+hp
Home ported 450+hp
Pro porting 500+hp
Extreme porting ( brazing, exhaust valve moved to fit 2.19/1.60) 600+hp

Have any links with someone who used these heads, it would be cool to see a dyno run of an old gurney race car you would think that them cars would have been built to the ragged edge