I'd definitely use copper spray on a new head gasket.
Make sure the bolts/studs are oiled to get a proper torque reading... and what are you torquing them to?
Not sure about the 130's but the older farmalls used to spec a really low number, which was later upped to something more reasonable... I just can't remember the numbers. I believe the new spe was around 85 ft/lbs but don't quote me on that.
The patter is important, working from the inside outwards.
As for why you lost the head of the screw in the first place - could have been over tightened when installed, and just picked that time to finally fall off.
Or maybe the saft is worn and the plate is binding in the carb - I'd check that.
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