progressive jet sizes

[Gunthner]

I have a Weber 32/36 DFEV (DFAV) progressive carb on a 1700 type IV in a 72' bus with a dual vac distributor. Does anyone know what size jets would (should) work best? Also, there is only one port on the carb for a vacumn hose from the distributor, where would the other one go or what distributor would be a good replacement? The engine won't idle down (below 1200 rpm's) and won't even die if I turn the mixture screw all the way in. Any help would be greatly appreciated.

Thanks in advance,

Gunther