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I just got through doing that with the stud that is closest the firewall. You can get header out without tilting engine. Take 2,3 out first. It will pass between 1 and 4 and the engine. Remove fuel line from rail and tie it out of the way. 1,4 will come out by turning it just so. It took me some time to rotate the header just right so it would come out.
As for the stud, I would try pecking on it with a punch. If that does not work, use a Snap On Blue Point stud extractor. But be careful and drill the bolt in the center. I ended up using a right angle drill bit extension with a flexible drive. My wife held the drill while I did the drilling. I had to buy a cobalt drill bit to drill the stud. Anyway, I misdrilled the stud so the extractor did not get it out. I eventually cut it out with a Dremel tool with a TC bit followed by a diamond bit. I lost about 40 degrees of two threads but that is a small percentage. If you are more careful than I, the screw extractor will work. Use the Snap On or something equivalent. It is not tapered. If you break off an EZ out, you have a mess.
It was recommended that the head be removed for the job. That is probably good advice. I chose not to do it, however. It is safer to do it that way but more labor intensive plus you have to buy a new head gasket.
Mine is an '86 turbo.
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