Carb,Intake,and Gears

I finally got the Dart up and moving again but now i need a new carb. Right now i got the old 650 dp off the truck on it but the turning on a lil tricky on double pumpers and i would rather have a vacumm secondary holley but which should i go with i know i want electric choke and i'm lookin at the street avenger series but what cfm should i go with. Also I'm still running the eldy small intake runner 318 intake, the one for the smaller head ports, oh yeah i for got to mention I have a 360 with "J" heads now. So would I feel or have any power gains by switching to the rpm intake or the air gap rpm? Last but no where near least what gears should i go with right now and most likely permantly I will be running 27 inch tall tires, all the engine spec are listed below:

CID: 367
compression: 9.9 to 1
Cam: CompCams PP484 284 292 duration .484 lift
Stall: 2800 to 3200
Tire size: 27 inch