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I would agree with your engine builder as far as cast being ok for your application. There is one other thing to be aware of, forged pistons resist detonation better than cast. Your engine has 11:1 compression and pump gas isn't what it used to be, probably would have to go a little easier on the mach if using cast , or maybe a hotter ignition(hidden of course) may help. Just my .02, hope this helps.