http://www.moparmusclemagazine.com/...mopar_electronic_ignition_system/viewall.html
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
