mileage. the harder i try the worse it gets...

I would switch to a eldevrock performer with the spreadbore pattern. Then I would use a Q-jet and tune the primary side for fuel econmy. (BTW, Q-jets were used on mopars from the factory)
Look for a mid eighties dodge 3/4 or 1 ton van. ) I know it sounds like blasphemy to put a Rochestor carb on a MOPAR, but when tunen right, you cant beat them for fuel milage. Even the promary rods are adjustable in the Q jet for fine tuning the jetting. You can raise and lower them! OH well just my .02 worth. I used to get 18 to 20 in my 72 demon with a 318 and a 2bbl stromberg carb.