Actually the duras park II IS very simple. Electronic ignitions don't get any simpler. A simple distributor,with a star wheel and reluctor, a coil, and an amplifier that simply provides a lot of current to the coil when triggered by the reluctor. The only way to be more simple is to eliminate the amplifier and use breaker points directly to the coil. Of course, we lived with breaker points for 70 years or so and I don't think you will find anyone recommending them.

BTW iw, the only vacuum you need is to the vac advance on the distributor. If the cannister on the distributor does not work out well, crane used to make an easily adjustable one for it that was cheap. You could leave the. EGR in place and provide vac to that, but it would be simpler to just block it off.

Good luck,
Larry