Alcohol? Yes, but very carefully.
Gasoline? Boom.
x2 + boost timing retard. + knock sensing + EGT
gasoline + 12.5 + boost == shrapnel.
Get the coldest sparkplug they make otherwise.... and suggest that you use only ngk plugs - why - the ground electrode are the softest - they'll melt off and stop firing it things get too hot. self protection.