if you are referring to this type of distributor...
http://www.ebay.com/itm/MOPAR-DODGE...r_Truck_Parts_Accessories&hash=item4d070ca496
No msd box is required...just hook it up to a 12 volt coil....you will have to by pass the internal HEI module to run a msd 6a
if you want to run a msd box like a 6A or 6AL....you want something like this distributor...needs external ignition box...
http://www.ebay.com/itm/CHRYSLER-DO...Parts_Accessories&hash=item2c7153b15f&vxp=mtr
