I've done 4 sets this year so far!
The new studs with the brass nuts are on the "Help" line at O'Reiley's for about $6.00,if I remember correctly.
I wrote a "HowTo" tip for the Tri-Five newsletter below,if you need more help if the torch method doesn't work.
I use a couple of nuts backed into each other, soak it good with a rust buster and try that first, then to the heat and visegrips, but I heat the manifold not the stud. Heating the stud doesn't sound right. IMO
I'm with Rwhit, I would try something to break up the rust first. If you aren't in a hurry, shoot it with PB blaster for a couple of days, and let it seep in. I think you would be happy with the results.
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