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whats nice about exploder (GT40 / GT40P) heads, is that they perform well and are still a stock FoMoCo cast iron head. if you wanted to be "dated" you could use early 351w heads with a little work done to them (like i have for mine) but by the time you put hard exhaust seats in and do whatever else the old heads need your cheaper to get a set of GT40's and be done with it. tristatecylinderheads has sets of P's with larger valves and upgraded springs and retainers for like 600 bucks a set with no core charge.