To get the most out of that blower/plenum combo you should also upgrade the throttle body and maf - presuming you already switched to some kind of CAI. 70-75 tb and 73-76 maf is a good match.
From there, the next set of mods would be a hi-perf. fuel pump and bigger injectors (Like a 190 lph fp and 36# inj. on an early model SC...).
Then maybe throw on a 5-10% blower pulley and raised top!