Will this distributor fit my slant 6?

French demon said
I can read 387 X 8
The fourth digit (X) is hidden by the screw, but seems to be 6, 8 or 9.

I suppose that you speak about the electronic control unit that is located on the firewall?
Like this one :
Mopar Replacement Or Conversion Black 5-Pin Ignition Module Dodge Chrysler Plym | eBay

That's the module (although I think I'd use a 4 pin one), but, you will need the wiring and ballast resistor for electronic too. There are kits available if you search around a bit.