Unless you can see the pistons with the additional holes drilled into the oil ring land i dont think you will know for sure. I just rebuilt mine myself and manually drilled additional holes into the pistons and did a port and polish on the heads. Find a reputable engine builder and just tell him what you want done rather than buy a rebuilt that is just as it was factory built.
The engine rebuilder should provide you with a Blueprint of all the engine specs so you will know all the clearances of your engine.
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