Reporting back.
Went with a new 7/8 inch master cylinder. Although my clutch seems surprisingly heavy to start with after carefully adjusting the clutch pedal bellcrank assembly (I think I put it back together a little off) it's still heavy but about the same as before after adjustment and with the bigger master.
I have the bellcrank set to where it is pretty much hanging straight down and rotates back and up as the pedal is depressed. Before I had the bellcrank positioned forward quite a bit and depressing the clutch required it to go down and then overcenter in going to the rear. I think that sort of amplified the pressure plate effort although it minimized pedal throw.
I double checked the McLeod clutch and it checks out as a regular street/performance diapraghm clutch and organic disc set advertised to be light in operating pressure. Same thing as in my 427 Corvette that I always though was so light in pressure.
I noticed the ERA bell crank on the clutch pedal has another hole on it closer to the pedal axle. Using it would provide more leverage but result in a lot longer pedal throw or require a really big master cylinder. Nothing in the manual that discusses it.
I will fire it up today since I'm going to change out the break in
oil, and see how the overall action is now. As long as the pedal stroke is a little shorter it will probably be OK.