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"...assume you mean hitting the stud off-center with the punch..."
Yes. Done properly and carefully, it's surprisingly effective providing the stud isn't bottomed out and jammed in. Tap lightly and off center.
"...a little leery of the tiny punch trick there: one slip and you score the cam..."
Yank the cam and give yourself some elbow room. Just be sure to keep the bearing caps in order and aligned (I've forgotten -- are they numbered like rod caps?).
Don't overlook the left-handed twist drill suggestion -- if you can find a left-handed bit, that it.
One final (off-the-wall) idea. You might be able to reassemble everything, including the one-stud bearing cap, and DRIVE the car to the machine shop or some other repair facility. Yank the valve cover and front bearing cap in their parking lot.
This would save you the considerable headache of pulling 'n reinstalling the head. Keep in mind that the cam has five bearings and really does not have an excessive upward load. Moreover, if it's the front cap, the freshly-installed, freshly-tensioned belt pulls downward.
Of course, if you have a car dolly or tow bar and can deliver the car to 'em, so much the better. Hell, a home visit by the machinist would be cheaper than pulling the head even if he makes several trips and you're paying the mileage.
--
Don Foster (near Cape Cod, MA)
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