"P345/30ZR19 in the rear."
Are you trying to keep this a convertible or will it be a roadster? That tire may wreak havoc on the top assembly. Hedges Speed Shop claims the top still works with 325/35R19's on this 67:
I have my doubts, I'm going to check it out sometime this summer.
My poor 65 project has been stuck in neutral for the last ten years. I just love some of the new chassis options that are out now - makes my Car Creations chassis look like a dinosaur.
Nick