Here's one for ya...

Use the 4 pin module & your problems will go away....
Pertronix modules have a checkered reputation. Cannot go wrong with the stock GM 4 pin module for your combo; coil should work ok with it if it is an E-core.
If you want a little more 'oomph' from the ign system, use the MSD 83647 module; has built in rev limiter, switches 7.5 amps v stock 5.5 amps.