Couple of exhaust and carb upgrade questions

[5.0 Fiend]

My stang has headers, (not sure what brand, they were on the car), aftermarket cam and lifters, (again not sure what brand), Holley stealth intake, with Holley 750cfm carb, mr gasket carb spacer, and 3.73s in the rear end. The duel exhaust is shot, so I think that I am going to buy a set of patriot side dump exhaust pipes, (does anyone have them on a fox body, I would love to see pics). Would side dumps be any good on a 5.0? My next question is, in the future I would like to get a new carb, (I was thinking maybe a Barry Grant demon carb). The reason being this is, I think a 750 is a little big for a 302, what would a good size be? Should I have a choke or not? What does the numbers mean on carbs, i.e. 650, 550,exc. is it the smaller the number, the more bottom end, the bigger the number, more top end? Any suggestions for a good carb, (it is going to be my daily driver, I want there to be a good balance between fuel mileage and power, (more power than anything). Last question, I want a different cam sometime down the road, something that really brings the beast out in a 302, any suggestions? I was thinking an edelbrock performer, 1500-6500rpm, since my Holley stealth manifold helps from idle-7000, supposedly. Is this a good setup, let me know what you guys think, thanks.