That piston has big notches. I think you would be fine with almost any head out there with your cam. You still have to check PTV clearence though, but you should do that all the time anyways when you get into aftermarket heads and cams.
World Castings has good stuff but there is better out there. I had there windsor jr's on my old motor and liked them. It is hard to beat the price of there iron heads so thats why I got them. If you are going to spend the money for the "lites" (aluminum) I think AFR 165's would be much better by a long shot for your combo.
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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