Stupid Distributor Questions

George, you either need to adjust the vacuum advance canister
[allen wrench through vacuum nipple clockwise takes away/limits
, counter clock wise add's more vac advance]

OR you need to richen the primary side of the carb and/or more pump shot, but like you said without the vac advance hooked up it runs fine so....
Probably limit the vac advance with the allen wrench say 2* at a time.
Good luck.