ZZP modified stock 1.9s ($200ish used), some modified LS style retainers ($40 new) and some LS6 springs ($60 new or $40 used, I have a set in the classifieds) are all you would need.

Headers $200 off ebay. Which sounds like they would not be good quality but plenty of people have used them in the 3800 world and have only good things to say.

Speed Daddy Headers is the company. All I recommend is to replace the stock clamps with exhaust bands from napa.

already have exhaust opened up and I have supporting mods running just picked up a set of rockers will run those awhile and then go to a cam

Mate seriously your original ideas were the 1'* to do ,run your cam,single chain and timeing gears roller rockers will add insane hp,,,,,,,i've got a australian vt commodore ecotec 3800 rwd ,and well,easier just to look at the mods i've done and you'll see what i mean,mate if your happy and got the cash to do these mods,you do it!!!!just be sure to get your cam dialed in and a decent tune to memcal!!!!

I was going to with a cam but I had a few other things that needed to be fixed before I get a cam...

my rockers, valve locks, springs, seals and retainers should be arriving any day now. Seems my hub needs replacement plus my radio blew so I want to have some music in the car so I am getting a new deck. Last, I am getting a tune so everything should be running smoothly

sounds good to me, a wise man once said "always go with your gutt instinct"funny i dont even know who it was!!!!!!

Well, I got the hub installed, coolant leak fixed and radio installed... going to do the rockers wednesday

ran into a problem with the hub, it would not come off come to find out forgot to unclip the wheel sensor... hit it a few more times and it came right out

Rockers, springs, locks and retainers are installed...
Mechanic said I should be running a smaller pulley now because I am not even hitting 6psi at 4000rpm. He said I should hit around 12psi at 4000rpm but not more than 15.

Does this sound correct?

You need to run only as small a pulley as you can without having your engine beat itself up. Contrary to a turbo setup, a supercharger'* boost is the amount of air in the lower intake manifold that hasn't flowed yet. With a stock setup, you had some more air that hadn't flowed yet, and now you have less at any given time because your rockers allow for better air flow.

The main reason your mechanic says you need a smaller pulley is likely that he isn't too sure about tuning. He may believe your car is not running right with lower-than-expected boost levels as seen by the PCM. Overall, you don't really "need" to do anything else if you don't want to. Your sensors will tell your engine how much fuel and timing to provide, and you'll be good to go with some more HP. It'* true you're able to put on a smaller pulley, but it'* a gamble with how small you can go.

Currently, you have an intake, front p-log, ported rear manifold, and rockers, right? Lower temp thermostat? You may be able to go to a 3.6 perfectly safely if you want to, but buying such a negligibly smaller pulley if you expect to mod more and get an even smaller pulley seems not to be necessary. Overall, good luck, you're set now unless you want a slightly smaller pulley, and mod on!