I am running the Indy EZ 295 CNC heads on my 512 low deck engine.I have the old Comp 650 solid cam with 150 to 160 closed seat pressure and around 370 open.I have a set of the Hughes Engines 1.5 rockers with their banana grooved shafts and their hold down kit.Everything assembled nicley and has not given me any trouble at all.I started running the car back in February and as of now I have close to 100 passes on the engine.