Bought a pair of Quick Fuel E-85 metering blocks at the March Indy cyl. head swap meet in 2017. Calculated a 30% increase in area for all the fuel flowing holes in my carb. and enlarged/jetted them up. Bought local E-85 at the nearby B.P. station. Runs great. No detonation at 9.9 C.R. and 13 lbs. of boost at 20 deg. timing. The only real problem I have is if you let it sit for weeks, the accelerator pump check valve weights under the shooter get "sticky" and the pumps won't work until I remove the shooter and wiggle them while pushing the pump arm. I do drain the system and flush it with gasoline at the end of the year. I am running bare aluminum fuel lines, bare aluminum fuel cell, regular A/N line and fittings. After a cruise/beating session the intake manifold feels to be about room temperature upon arriving back home. For me the benefits more than outweigh the liabilities.