Drilling & tapping for screw-in rocker studs should be left to an accomplished machinist. Mention that as have examined several cracked rocker stud bosses on previous press in stud Pontiac heads, heads that were MUCH more Desirable/valuable than later 60's Pontiac press in stud heads.
Swapping to an 11 bolt timing cover, will need the correct "stagger" wp pulley & a '69 front alt bracket as the lateral spacing is also different. Not exactly an easy to find pulley in the AC diameter. Know this, as I ship out a ton of nice original Pontiac brackets, pulleys every year & never post a for sale listing here on PY or on eBay. Desiring a nice used '68 timing cover, stock those as well, currently have two.
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Buzzards gotta eat... same as worms.
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