I have the old mechanical direct connection carbs so not sure how it will translate to the vacuum but I have 64 center, the ends are staggered at 77/78 78's on the deep plenum side. My A/F meter shows still lean at WOT with a 13.5 so I think I'll end up with close to 79/80 on the end carbs, I have a lean tip in when cruising so I may up the 6.5pv to 8.5'and see what happens. Vacuum on my engine is about 7.5" at about 850 rpm in gear and about 12" in park at about 1,000 rpm. I run msd 6al, I'm at 11.2 cr and run on pump 93 so my initial is about 14 btdc with about 29 to 30 total.
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