right now i have TBI but i want to go with carb...right now i dont get bad gas milage but it still isnt very good at all...anyways if i would swap to a edelbrock intake and a 600cfm carb (not sure which one yet i just know i want vac secondaries and electric choke) anyways if i drive it easy you think ill see any difference in gas milage? i know if i get into it alot ill kill gas but im thinking ill probably get about the same milage with it if i take it easy

 

Since you are changing a cam and intake, it's difficult to say. If the only difference was the carb, then you should get around the same mileage. If the TBI wasn't working correctly(hurting mileage) you could get better mileage with a carb.

 

I lost about 3 MPG going to Edelbrock intake and Carb from Quadrajet... I could probably make that back up with headers and exhaust.

Edit... didn't realise you already have headers.... In that case I'd say you'll lose just a little bit.