Wally is correct. I thought it was common knowledge there are two stud patterns per head. Sorry
. I used factory cast stubs I cut off some old heat exchangers to pattern my hole locations on the jigs. If you make the holes on the mounting tabs for the studs to go through too large you risk exhaust leaks from heating and cooling cycles. Can take a pic of the difference between the two if needed.
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1970 T1 W/MassIVe 2913cc RAT/?EFI? w/direct fire (very soon) and 915 trans
1962 SC 1776cc SP 944NA brakes, 993 wheels
VKG