Drag Car Wiring Advice

Aftermarket with a switch panel. If you still want to use the key to crank the engine over, that’s easy, just don’t use the ballast resistor because they go bad. So make sure the ignition is wired through a a separate switch.
Take your pick, painless, K&R (my personal choice), ARC, Digital delay, Leash, too many to list. But no matter what you pick, it will hands down be better than the stock wiring harness.