Proper Exhaust Diameter fo a 4bbl 225?

I have a head in the shop. I was going to do that one for a '74 Dart. Trying to think what I had taken off that one. Trying to remember how it had been planed. I remember measuring the chambers at 45. Did I polish them? Maybe. I'll be out there today. Any porting? I'll be out there today. :rolleyes:
I have this worked, 318 valved, ported factory prototype closed chamber head going on my next build.
CLOSED CHAMBER PORTED (1).jpg