Probably not a fair comparison to think that your Pontiac willl perform the same as an LS engine. They have superior ports and combustion chambers (among other things) compared to the old Pontiac design.
Either way....it looks like you have some good parts on your car already, you would probably gain more power from a better unit such as Vortech, Procharger etc. along with some good brackets such as Luhn. That would also give you room to grow if you want to add more boost later on.
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