Call Pat Collins at TechWest Racing in NC. He repairs MSD products and is great to deal with. 704-995-4286
I'm not 100% sure (been a while), but I think I had the same thing happen to mine and everyone I asked said it was OK. I use the same 3 stage retard box w/ a 6AL and crank trigger.
'70 hemicuda...8.91 at 150.5 mph street car...Mopar Action feature Dec. '14
'69 road runner 440 w/ Indy SRs
'69 road runner 440-6, 4 speed...Dad's ride
'71 Demon 340 resto project
'06 GMC 2500HD LBZ Duramax...toy hauler
'16 Grand Caravan SXT...baby hauler