I read your other post and it seems to me that you have the wrong headers. I think you have 302 headers. I would ask the place where you got them if they are for a 351w.
The 302 headers will fit the engine but they won't fit in the car!
Trust me, I found out the hard way!
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'82 GT 351W C-4,BBK headers,Carter 625 carb,Comp.Cam,Flowmaster exhaust.
1988 GT...T-5,bone stock
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