Erratic Timing

Also from long ago, I think Crackedback posted this. Here's a chart showing approximate advance re: slot length. Also, are you aware of the aftermarket FBO advance limiter plate? Some guys have used these and say they work OK
How to limit mechanical advance in a mopar distributor, tuning for street, strip or all out racing, cure that rich stinky idle, win races
=======================================================
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