Well, before you start tearing into it, I'd make sure everything's in working order. I'd make sure there's not a single vacuum leak, I'd make sure your timing's good, I'd make sure you're getting good fuel, and I'd do an ignition tuneup (cap, rotor, plugs). I'd get a vacuum gauge to see what it's doing at idle if you can't see anything visibly broken. I think at least 18 inches of Hg should be your goal. As far as timing goes, I'd shoot for 8* initial. A little more if you can but don't let it ping. I can tell you that a few degrees of base timing make the difference between a slug and something feasible even on a stock motor. With fuel, I'd just change the filter for now. After that, I'd try her again and see what you think. It still may not be enough, but I'd be surprised if that didn't make a positive change. Looking ahead, I'd keep the Quadrajet, get a Comp 12-300-4 cam to put in it, see about some head work or aftermarket heads; get some long tube headers and do a nice dual exhaust, and maybe see about a new intake just to top it off. If you want to get rid of the EGR, then Edelbrock 2101 is good, or if you want to keep it, I'd go Edelbrock 3701. Those are non-Vortec intakes so if you're looking at Vortec heads, you'll need a higher end (and more expensive) intake. As far as emissions deletion, none of it really hurts you besides the air injection. That's gotta go anyways if you do headers. The EFE will also go when you remove the manifolds, and you can get rid of the thermal vacuum switch that goes with that. I would punch the cats, delete altogether, or get 49 state high flow ones. The EGR is up to you if you want another intake, or if you keep the factory one, you can get a block off plate and delete the solenoid that controls it. I'd keep the PCV valve and evap system if it were me. Those actually do a good service in my opinion. I'm probably missing a couple, but we covered EGR, EFE, PCV, Evap stuff, air injection, and the little solenoids and TVS's that control everything. The vacuum diagram will be an invaluable tool on what can go and what can't once you decide what your plan is. At the end, what matters most is that you don't have any vacuum leaks.