With that cam 10:1 would be acceptable with lower boost like you are looking at even running E50. I wouldn’t go any more because you can still run pump gas if you get in a pinch assuming this is a street strip deal.This is the Camshaft:
Camshaft Manufacturers Description:
Fair idle, good midrange and strong top-end power, 3,000-6200 rpm powerband. 2,500-3,000 rpm stall converter. Compression: 9.5:1 minimum.
Basic Operating RPM Range:
Intake Duration at 050 inch Lift:
Exhaust Duration at 050 inch Lift:
Duration at 050 inch Lift:
236 int./242 exh.
I have ran e85 for years and have never seen that much variation. And I would not be chasing the tune for e70-e85.E85 varies a LOT. Summer blend can be 90+% and Winter can be little more than 50%. If you run E85, you need to check every batch. When you find a GOOD batch, buy it by the drum and store it in SEALED containers filled to the top... and stored out of the heat/direct sunlight.
If you don't do this... especially with a carb... the tune will drive you nuts.
The Sheets stations that sell E85 here say right on the pump... can vary between 51% and 83%.I have ran e85 for years and have never seen that much variation. And I would not be chasing the tune for e70-e85.