looking for 318 tips and advice

Yeah it still has the crappy 2bl carter and I already got a edelbrock rpm performer (I think that's what it is) used for like $100 canadian and plan on getting a 4bl soon for it, I'm curious what kinda of cfm would I be able to run?
For a stock 318, I would think a 600/650 would be doable and still give you room to step up some.