I’d like to mention that if you’re not even going past 6 lbs of boost, you may not even need to lock out the distributor or even run the btm. Set total time to 30* and walk away. As long as you’re not running on a razors edge of high compression and/or questionable afr.
This was my plan for a very modest 5-6psi setup on my 318. I figured (possibly incorrectly) that my adjustable vacuum advance might give me back a few degrees, at least at very low throttle.
I am however now running a stock distributor with the 5pin HEI module that when the 5th. Pin is grounded via a pressure switch, retards the ignition 5 degrees!
I just bought this new for $10 on eBay, and can now also run a big coil with no ballast resistor.
BTW, I am pretty sure I read about doing this here in this forum, so thanks guys!
