2 barrel , 4 barrel, whose got the answer?

wow, thanks for all the replies! I usually hang out over at vanning.com, was doing a internet search for the carb and came across you folks. glad i found you, feally. so to go a little deeper, i will most likely keep the lean burn in the van but not hooked up. at least not until i get some miles on it with the new system. Thje ignoition chang im doing is going from a double pickup to a single pickup, hence the need for the vacuum advance. The low cost way to do hei on these (and others) is to pickup saiid distributer, using a gm hei to be the “box” the trigger if you will.. Ill put the hei module right uinder and con nected to the dizzy, using it asa a heat sink wwhile minimizing wire length. I went with a high output coil also. I think its alot like what “318will run” suggests. Ive been looking for that carb about 2 months right now. If someone has one that would be super. I can wait for the 4 barrel at a later time. Why the 4 barrel? esp a thermoquad or quadrajet? smaller primaries (than 2 barrell) so if you keep yoiur foot out of it it will be more econ. Back in the day i had a 74 dodge with 318, i got 15 with the ac on..with the ac off , on cruise and with fairing i got 18. which is what started me down this rabbit hole..(getting 10 right now). yes it runs but it is hotwired across, batteryh to coil for starting, once started will run but… need this to be reliable.
so thanks alot, ill trty putting a wanted add up