1971 Dart Swinger

I'm thinking the spark is getting blown out and the distrib is worn out.

I've been looking at the MSD 6AL2 Programmable ignition controller and will probably be going with that one over the 6BTM.
I'm not sure what distributor i should go with, a Billet 121-8534 or Street Pro-Billet 121-8388.

Does anyone have any recommendations?