I use an old Crane HI-6 ignition system with the dash-mounted adjustable timing adjust option. I usually set it right on the edge of detonation - which varies on any given day.

My current spark plugs have a heat range 3 settings cooler than the factory-recommended plug - which allows the timing to be advanced a bit over stock. The plugs also got a "fluff-n-buff" job with a bench grinder buffing wheel before installation, to remove the sharp edges on the ground electrode. Sharp edges tend to encourage detonation, so "smooth" is good.

The Redneck Special: 88 Ram 50 2WD XCab with 167K on the original 2.6L, 5-Sp, Weber 38DGS, Crane HI-6 with timing adjust, 4-for-$100 tires, Generac 4000EXL 4KW AC generator, Hampton Bay 12KBTU window air conditioner sticking through a hole hacked in the back of the cab...All it needs now is a gun rack...