Depends on how the idle quality is and how the distributor is set up. I have 14 degrees initial ( no vacuum hooked up ). Then I plug the hose into the manifold, having the vacuum canister set for 10 degrees max, giving the engine 24 degrees at idle. The engine idles better at 24 than 14. Also have 20 degrees in the mechanical advance. So 34 degrees open throttle and 44 cruising down the highway.
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