650 or 750 cfm. carb??

Hey guys and gals, i've been doing some carb. reaserch and am looking for opinions on what you guys think i should buy. I've narrowed it down to an edelbrock and a performer series but i'm not sure if the 750 cfm will be too much for my application. I'll be running a stock 360 but here's the catch, this motor will be seeing some performance upgrades in the near future such as a head job, heavier cam, aftermarket intake etc. What i was thinking is buy a 750 and then lean it out until i get some more power and then re-adjust it instead of having to go out and buy another new one. I'm open to opinions so please let me know what you guys think. Thanks!!