Someone had a neat chart showing how much to weld/file the slots for a given advance and which springs to tune the advance curve. I tried both seach engines and struck out.

Thanks!

Not a chart, but I found this pretty quickly:

https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/5836619/site_id/1

And this:

https://board.moparts.org/ubbthreads/ubbthreads.php/ubb/showflat/Number/5420827/site_id/1

Will keep looking for a Chart and Spring Advice.

I read a book with a section on the procedure, "Old Reliable" , by Don Dulmage.

Once again, not a Chart, but some good advice on slot length and everything about how to modify the distributor:

http://www.jefframin.org/library/distributorRecurving.doc

Here is a Post with a Chart on the First Reply:

There's a "backyard chart" of slot length to degrees advance............

Dimensions for Mopar distributor slots, in DISTRIBUTOR degrees

Modifying advance slots
degrees / slot size
6.............. .340
7................355
8................375
9................390
10...............405
11.5 ...........420
12...............435
13...............445
14...............460
15...............475
16...............490
17...............505
18...............520

http://www.forabodiesonly.com/mopar/archive/index.php/t-182247.html

D_C , you ROCK!
Thank you!

Remember that specs are in DISTRIBUTOR degrees which are half of "crank" degrees. This advance is marked 15, which is THIRTY at the crank. Way too long. "Generally" you want 22 or LESS at the crank, so 10-11 in the distributor

(From the "4A-BodiesOnly" web link)

I'd (1) set initial with "vac gauge method" (2) with that number in hand shorten the slots (per the chart) to get 35 total (initial+slots with can capped) (3) mix/match springs so you are just under the pinging point at WOT up thru the gears on your hottest/driest day (4) then plug in/adj the can (CCW with a 3/32" allen wrench makes it come in slower) and you want to be just under the pinging point in everyday driving under varying vac levels/RPM levels on your hottest/driest day. Mr gasket has a light spring kit 925B as does MP (the 925B might b e the mr gasket number. I would toss the heavy spring with the long loop on one end. spring rate is linear no matter which ones you use (ex for the long loop one that I would toss). here's a chart for #3 just for reference (if I can post it) but go by pinging & there is silent pinging so have a slight cushion