[72SB]

OP

did your truck come with a HEI dizzy or was it originally a points dizzy truck?

if the later than the resistance wire needs to be replaced with a 10 gauge stranded wire

I have Pertronix module in 2 of my classic car/trucks using the stock points dizzy. Just swap out the resistance wire.

If you have the white cloth covered wire coming out of your bulkhead connector...you still have the resistance wire which needs to be replaced

Your issue may be more coil and or wiring