if you are running 11.5:1 pistons you would have to "underdrive" the blower and it could work, maye someone @ weiland or BDS (blower drive service) would have a program that could advise you more.

10-20% underdrive- smaller pulley on blower

if i had 11.5:1 i wouldn't WANT a blower, except that it will be a really nice conversation piece/artwork on your endtable