raising compresion on 98

i'm in the prosess of installing a thinner head gasket to up the comp. from 10:1 to 11:1 and i was wondering what kind of octane level will i have to run? also what kind of power gains will i be looking at once i get it done? i'll be running open exhaust and a custom fab. cold air intake anlong with a slightly ported head with a mirror smooth port polish and a ecu upgrade with ac and power steering delete. also it's a 5 speed.

in about a week or two i'm going to start work on making a short throw shifter.