Kieth Black as quench dome pistons for that & also you would need to mill the open chamber recesses in the heads to set that dimention (the chambers are uneven/sloped as is) to a quench distance (.040" MAX) and likely mill the quench domes also. it'd be alot of shop time. Just me I would consider some magnums before that. EDIT Steve Dulcich of Muscle Motors fame has some excellent porting articles online for those 70's smog heads (Google it).