Advance Plate
"Back in the day" I ran mine for quite awhile with NO springs. It dragged enough "friction" on starting to allow startup, and was "full advance" as soon as it fire.
Only "real" answer is to recurve the thing. It is NOT that hard. You can do it yourself if you are patient, specially if you have another dist. to run in the meantime
This is a pretty good article
http://www.moparmusclemagazine.com/...mopar_electronic_ignition_system/viewall.html
And crackedback or somebody came up with these slot dimensions. Note that "as usual" these are dist. degrees
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