I can't even imagine how that witness mark is possible on your TO. That would take a lot of force from a hardened fork. Definitely, the pressure is not applied evenly (flat against the TO), it's digging at an angle.
Maybe from the pedal to the TO, go all stock? Your bell housing is already stock, so not too bad.
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1965 Pontiac GTO
455/469 w/ #48 Heads, '65 Tri-Power
9.25:1 CR
Stump Puller Cam
Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00
3.55 Rear Differential
Front: 225/60R15 Height: 25.6"
Rear: 275/60R15 Height: 28"
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