hi I have a 69 firebird with a 350 from a 72 lemans 2 barrel carb. I cant get a good 2 barrel anymore so I wanted to put a 4 bbl on it. I want to go with the Edelbrock preformer intake and Im not sure wether to get the 1405 or 1406 carb... the car has the heat riser style choke now so Im assuming I should get the 1405 , does this sound right?? I dont want to make a mistake. Ive owned the car for 26 years now and its been sitting for the past 3 yrs and Im dying to drive it again. Any insight would be greatly appreciated