Do you have any distributor now?
If not this would be your shopping list...
Stock Mopar electronic distributor $45 Advanced Auto
Yellow round Accell coil $33 Advanced Auto / Summit
Coil bracket MSD stock style $7 Summit
Borg Warner HEI 4-pin module (order for a 78 Chevy truck) $28 Advanced auto
Design 2 Drive HEI bracket $25 (optional but very nice)
I would also go the the junk yard and cut some factory connectors for the distributor so you do not have to cut any wires in your original harness.
If not this would be your shopping list...
Stock Mopar electronic distributor $45 Advanced Auto
Yellow round Accell coil $33 Advanced Auto / Summit
Coil bracket MSD stock style $7 Summit
Borg Warner HEI 4-pin module (order for a 78 Chevy truck) $28 Advanced auto
Design 2 Drive HEI bracket $25 (optional but very nice)
I would also go the the junk yard and cut some factory connectors for the distributor so you do not have to cut any wires in your original harness.