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  Sounds like you have a good understanding of getting the bolts out.

The only thing I would add as a sugestion, would be to "knock the hell"
out of the head of the bolt a couple times before you go giving it a
twist.
The technique you've posted is exactly how I take them out.  I stick my
socket and extension on them, then knock the hell out of the extension
a couple times with a 5lb sledge to dislodge the rusted threads a bit.
 I don't have the luxuary in the shop of the "soak for a few days"
bit,
but that's only going to help you, not hurt you.
 Be sure not to overheat the manifold, where as the bolts themselves
are weakened by the heat and shear off.   Other than that, go with your
plan.

as to a repair.........
if you're not up to drilling and tapping, there IS a repair clamp but
the cost
is around $30 to $40 best I remember.  I HAVE used them several times
in the past, but I found out over the years that it's just a time/cost
thing,
so now I drill and tap.
 The clamps resemble a small c-clamp with pointed contacts instead of
pads.
Call NAPA if it gets to that point.

let us know how it turns out

~:~
Marsh
~:~

I don't touch bolts like that without a applying a rust penetrant first
and have had good results with Kroil.
http://www.kanolabs.com/

Thanks for the responses. I wire brushed the exposed threads, soaked
them with PB Blaster, then worked them back and forth a bit. Soaked
them again and let it sit overnight. Wire brushed again, soaked again,
worked back and forth until loose then removed. I think it was the
overnight soak that did the trick.
Again, many thanks for the responses.
NS