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Had the same problem -although not as many bolts .Tried the ezout approach and it wouldn't budge them ,even with heat .I don't think the propane torch is hot enough-the head is a big heat sink .
Ended up drilling the bolts out and using helicoils .The trick was getting the holes straight and the old exhaust manifold was a good drilling fixture for the ezout drill bit .For the front and rear hole you will need a long drill bit .
Good luck.
Dave
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