Re: Vacuums Hook up ?
I prefer to use "manifold" vacuum for the distributor vacuum advance. Manifold vacuum will have vacuum at idle and part-throttle/light load conditions, but as soon as you hit the go-pedal, the vacuum will disappear and you will be running on mechanical advance only. The higher timing advance with manifold vacuum will help engine idle.
Of course, if you are seeking to have a more choppy idle, then use the "ported" vacuum connections on the carb (one with no vacuum at idle). This will allow you to operate at the base mechanical timing at idle, but will kick in some vacuum advance as you start driving.
Experiment with the ported versus manifold vacuum lines and see which you prefer. Also, your new dist probably has adjustable vacuum advance, so if you're pinging you can retard it a little.
Dave F. in Rhode Island
'68 Camaro SS Accel DFI 454 (SOLD - I'm a boring Corvette owner now)
Bought my first big-block Chevy in 1970