| I don't have your answers either.   I can tell you how I handled my similar situation.. I ended up rebuilding a NA motor with Unknown Sourced heads.. I modified my Gears to make then adjustable, as they were WAY off..  If I was to do it again, I'd buy a set of adjustable Gears..  On my NA I ended up with a Compression pressure of 235PSI..  so a LOT had been carved off of the heads.  Cj 
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