Replaced the dual point with HEI

Dave999 said
id be inclined to stick with 40-45 thou on a small cap distributor, but that is based on me not noticing any improvement when i tried 45 and 50.... rather than misfire or phase-ing issues. You may find different. It is going to depend on CR and induction, cylinder pressure, fuel and air quality, exhaust efficiency, cam timing, all that stuff that dictates a fire or no fire... lean mixture or pollution of incoming charge with sucked-back-in exhaust gas etc

273 with 10.5:1 .030 over egge piatons that calculated to 10.25:1 when i put it together 15 years ago.

I've already put the gap back to .050. At .060, I was having a miss after driving it awhile a couple days ago. No miss at .050.

Dave999 said
Also I like my current ignition leads... i don't necessarily want to turn their silicone core into scrambled egg in double quick time.

i approached putting back vacuum advance in potentially the wrong way but got good results

i messed with my mechanical curve until i thought i had it the best it would ever be

then wound down vacuum advance to the smallest amount (how many carb runners do i take a feed from...one only, now) and connected it to manifold vacuum...
pulls in lots at idle and a bit at just off idle

provided just enough to get me off the line a bit faster.

Planning to mess with dialing in the vacuum advance today. At the mopar meeting last night, a friend suggested this same thing. He converted the 383 in his wifes coronet and described basically the same thing.

Also said he had tried some weaker mechanical springs and ended up switching back to the originals that came with the distributor.

Dave999 said
now when i lift off throttle at 70 mph it is no longer like i hit a wall of air resistance, the car just carries on, i must be burning something that i wasn't able to before.
From a driving point of view i made my car feel smaller and more agile....it could be described as "Nippy"

more work needed... but fuel economy improved and minor flat spot at 1800 rpm, a feature of weber's coming off transition into main circuit, gone. if id listened to the internet id be drilling more progression holes in my expensive carb bodies setting a "fat" idle mixture and drilling holes in throttle plates to compensate.... making matters way way worse with irreversible changes...

it is well worth putting in the effort on the vacuum advance front, makes part of your ignition curve demand/load controlled, as well as rpm controlled.

Dave

Thank You Dave, I really appreciate the input!