Hi GTO Mike,
If you elect to keep this added disc brake option on your ‘67 I would SS sleeve everything front to back.
Four piston calipers
Master cylinder
Rear cylinders
Check the proportioning valve that’s circled in your photo.
The master cylinder is unique to 1967 disc brake as I show in the photo of the ‘67 HO I restored years ago.
BTW, your WT 335 HP has the added HO exhaust manifolds which require a completely different engine wiring harness.
But that’s another day.
Good luck on your project.
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1965 GTO Unrestored Survivor 389 / 335 4 BBL.
1966 GTO Unrestored Survivor 389 / 360 Tri-Power
Early (63-66) Schwinn Stingrays, all Unrestored Survivors
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