Vacuum advance

[ColoradoCuda]

I know this has been asked 1 million times, but I have yet to find a satisfactory answer. I have a 71 Cuda with a very stock 383 and an Edelbrock 750 CFM carb. Should I go with the ported or manifold vacuum for my vacuum Advance? Also, any recommendation for initial timing with the vacuum Advance disconnected?

 

[Challenger RTA]

Such a simple question and so many answers. Mine would be. It would depend on how the engine is built and used, if advance is used at all. Requires Deep thought.

 

[Katfish]

I would use ported and at least 6-10 initial.
I had interesting problem when I installed Fitech on my 340.
The gas mileage actually went down and I was stunned.
I found out the port on the Fitech throttle body is too high, and the vacuum advanced never kicked in at light throttle.
I switched to manifold vacuum and it fixed that issue and the gas mileage improved, as expected.
So my advice is, start with ported, and check it.