Not Ranked
You need to know how big the combustion chambers are. If they are big chambered heads and you havent decked the block (cutting the surface where the head bolts to the block) then you can probably run flat tops. Also need to know how far in the hole the pistions are. If the pistons are down in the hole 20 thou and you have big chambered heads you can probably run a little pop up piston with no clearance issues at all.
Hope that helped.
Gene
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" If it wont break em loose in 3rd gear, it aint enough power "
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