Which unit are you using? I have some time to look on line right now. Might as well check into it.
6a, which I plan on robbing for the Z . They have a new unit out where you can control everything including different ramps for timing via laptop ,around $500-600. Very affordable tech for bracket racers. My buddy has a 8.9 72 Camaro his daughter races at mid 9's. We both run locked out distributors and hard starts when at operating temps have been cured. He's sold.
I'm giving it a try next spring. I need to take some more hit out at the line.
My Sun Tac is mounted in dash ( fuel gauge spot) has been 44 years. I had the Mallory, oil/water temp gauges mounted on the cowl. With the glass snorkel hood really had that old super stock look. I did have issues with the MSD dial accessory to control rev and went back to the chips.(Anglia ,I'm bouncing between cars)
These 302's can take a ton of abuse with only high REV issues I'm aware of being in the valve train. Also heavy pistons . Strong crank and rods.(Relieved of course now) My dad shifted at 8200 ,other than some ignition and traction issues she lived to see another day, that was in the 70's and hasn't seen that kind of abuse since. That being said ,today It's staying under 7 grand----you can pickup a dressed 383 crate motor for what one of these blocks are worth.