I should point out that for those reading this..... the same distr mod can be performed for use with a carb.
Just leave the mechnical adv operational, although hopefully you have cleaned and lubed and set the proper adv curve.
Then when done you simply grab a GM HEI 4 pin ignition module and mount it on a small heat sink like a 1/8"x1.5"x5" piece of alum and bolt it to the coil hold down bolt.
Connect the distr leads to the G and W terminals and the coil + and - to the other 2 terminals.
I recommend a later GM TBI coil or the ford TFI coil for a little boost.
You will now have the same ignition as the big cap GM HEI for about $20 in junkyard parts.
Best part is all the parts can be found at any store or junkyard unlike some of the aftermarket ignition swaps.
The pertronix works but if it goes bad you are stuck converting back to points while waiting for your replacement to come in the mail.
