1967 V8 3 speed clutch diameter ?

[Abomb]

So, I think I’m going to swap in a T5, I have a world class Camaro / firebird transmission I picked up several years back. My truck is a 283 / 3 speed, can anybody tell me what diameter the original clutch / flywheel is? I really want to have everything on hand before I start the swap, and I will probably have to order the clutch disc, or clutch kit. I know that the T5 is out of a 1989 firebird formula, V8 car.

Thank you