Hank is right-on. I’d never hook-up a distributor to a standard vacuum port (like what the brake booster needs). It annihilates the whole advantage of vacuum based timing advance. The ‘timed’ vacuum port provides almost no vacuum at low idle, good vacuum at initial part-throttle, medium vacuum at mid part-throttle and almost no vacuum at full-throttle again (this scheme may change slightly according to carb brand and model). It enhances both part-throttle response and fuel economy. If you need more timing advance at low idle, just spin the distributor body. That will shift the whole timing curve. If that gives you too much timing as RPM increases, you can work on the centrifugal (mechanical) advance, using stiffer springs in the distributor (or reducing the weights…).
PS1.: Remember, carb is not good to your body!
PS2: Gas dropped back to $2.05 here!!
