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I dont think you need anything but an out of the box eddy head to make the 500 hp your requiring, if your willing to stroke it.

I just made 511 hp with stock eddy heads, an air gap intake and a 750 HP carb.

MY 430 BUILD


with a 340 done right,super easy w A 4" crank for some cubes...and a lightly touched up set of eddy's..if i were you i'd do it with a hyd roller cam,no maint type deal