Re: 21 stud deck height, gasket thickness, etc. questions.
Would be nice to do it on a CNC - but as you mentioned, the hardest part is getting the deck surface parallel to the machine and holding the thing down. You might consider making a big plate to mount the head on - with stand-offs for some studs to set the height and make it parallel and then 4 threaded locations where you could put bolts through the spark plug holes.
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