BB ingnition timing

I haven't checked if they work for both B / SB but FBO has a limiter plate

Slot length: Don't give me credit, found it elsewhere. BEAR IN MIND these figures are distributor degrees, so you want something in the 10- 11* range (example) to get 20 -22 at the crank

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