I think you really need to go research some more.
From your posts it really doesn't seem like you know what exactly is going on here.
If ANYTHING...get a DHP PCM...buy one from 3800 Performance.com
Headers: There is an entire thread on them...read it.
Pulley...put it on last with the PCM.
Plugs: Autolite 104's gapped @ .050"...
Stock cars dyno close to 200 FWHP...and most basic 3.4" setups run about 230-240 to the tire...most of the time. Also depends on the conditions and the shape your transmission is in and the dyno your running it on.
