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I finally got some time to tune the carb today and what I ended up was 32 degrees of timing in N and also 32 in D (foot on the brake). I got 15"hg in N and 12"hg in D. I had to turn up the in D idle rpms just a tad to get the 12"hg but the vacuum and the idle are rock solid.
It still likes the A/F in D around 13.5. Once I approach 14.0 in D, the engine just starts to shake allot.



I have been reading your post with interest for awhile now. I am considering this option for my 383 w/ 650 Mighty Demon. It runs very nice, but fat on the fuel curve. Did you have enough room for adjustment of the idle RPM when you plugged her in to get the higher advance?

My 650 has its throttle plates practically shut and I was worried if I put that much initial into it I might not be able to get her down to a decent idle if I went this route.

'73 GK6 Challenger Rallye - 340 4-Speed