Don,
Thanks for the reply.
I found a website that lists the RVP for the different race fuels.
http://www.smithtex.com/racing/fuelcomp.html
It shows Sunoco Supreme with 8.0.
VP C-12 is 7.75.
I need to read up a little more, but Sunoco should be in the ballpark or a little better? The higher RVP should make it vaporize quicker?
Motor is a 327-250 horse with the 4GC Carb. Small valves and 10.25:1 compression.
Jeff