They don't care or know if it's gas or alcohol. Engine only cares it's getting enough fuel to not go lean.
Stick a 15.5 in it before you drill anything.
Seems unnecessary to mod anything with a stock cam/ high vac situation.
Makes sense it can't handle much initial w/o pinging. Jmo
I might drop the timing back down so I have more control over the idle. What else can technically control idle speed other than curb idle, idle mix, and timing? IFR?
Should I put in a 15.5 and block off the middle emulsions?