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The exhaust studs have been in the heads nearly 30 years with thousands of heat cycles, they aren't going to be happy about leaving. I would use mapp gas, propane isn't hot enough. Heat them until they are cherry red. Hopefully, none will break. If they do, use a reverse bit if you need to drill. It's best to have a drill guide.
If you're doing the guides, I would wait until you pull the motor and do it as a single project. I did the same thing three years ago.
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Greg
86 Coupe (stock - pretty much like Butzi designed it) - gone, but not forgotten
65 Ducati Monza 250 & 66 Monza Junior (project)
"if you are lucky enough to own a Porsche, you are lucky enough"
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