Wanting 500 hp (or close) out of a stock stroke 360

I have the icon Pistons in this motor. I see you have used them before as well. Have you ran spray on them? I gapped the ring for spary and have the timing retard box and a separate fuel system for the spray. But I was wondering if you have spray 200 hp shot on these before?

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I have not sprayed with them before but see no reason why they won't serve well. I might look at a heavier wall piston pin from Trend/Diamond though. J.Rob