carbed out

I still have vacuum can hooked up, I disconnected to check for leaks , it made no change in vacuum, or running, so I put back on, I set initial at 12 as a test ,motor smoothed out , re-adjusted mix screws for idle speed increase and vacuum read , I didn't check all in rpm again because It ran good enough to get to car show, electronic mopar with one lighter spring installed , I will continue to tune and test, last test of all in was 34 at 2800 I don't know if that changed with initial change to 12. I tested adding advance to 20 -24 from 15. Ran worse and was breaking up the more I advanced it. Swapping back to the edelbrock ,smaller jets,meter rods have made it run decent , I do agree my vacuum is low at idle, I have a rebuilt magnum 318 ,fresh with 512lift comp cam waiting in the wings, the intake and carb will be used on that motor, I am sure the intake is too much for the 273 but that's how it came with the car, just trying to run it till I can gather rest of parts, thanks again for all the advice. I will try to post a video of it running.