MPG The Best Of Both Worlds

I'd run the vacuum advance on the ignition and use something like the Street Avenger 670 vacuum secondary. That cam is not a low rpm deal, and the engine has low static ratio so it's not going to be snappy. I dont think simply lowering rpms will help. You need to keep the engine in it's rpm range but give it as much advance as you can (I'd wager you could re-time to 20° initial and 38° with no problems at all). With the loose convertor and gear I dont think you need that second accelerator pump or larger power valve restrictions that the DP carbs have.