hey,
I just installed some tri-y headers and had different problems, even though my car is a 66 w/manual steering. Mine is against the bellhousing, and my clutch linkage was slightly touching it, I think that lead to premature wear on my clutch, it eventually wore it down to the rivets the shop said. I was going to look into it, but not in time i guess. I also had new motor mounts, so i dont know if that could be your problem, or that you'll only get new ones from changing them.
When I did the motor mounts, i had a friend help me out, we did one side at a time, we had one side still bolted to the motor mount and the end getting changed un bolted, from there we jacked the car up from the crank pully, although this didnt sound great i went with it since he works at a shop that specializes in mustang work, we just put a 2x4 in between the crank and jack. The operation went along smoothly and the car runs great so I dont think it damaged anything either.
About the clutch linkage hitting the headers, the shop i took it to but a little dimple into the headers when changing the clutch to fix it.
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Under Construction 66 Coupe
-289 V8 4 barrel Holley 600cfm carb - Headers - Flowmaster 2 1/2 dual exaust
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