Be Careful my friend and I where going through his 289 for a '65 coupe, one bolt was "fused" I guess you could call itand wouldnt come out. We got real hefty with a breaker bar and they have that name for a reason. We broke the bolt loose but it also broke half of the threads out of the block closest to the outside edge. As you know the bolt runs through the gasket face. He had another friend weld the piece back on and fill the cracks with weld and machined it off flush with the true surface. We retapped the hole and it runs fine, no leaks, but be careful.
Pony Power Forever
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