I prefer the old Mopar electronic ignition conversion kit with the orange box. On the newer ones you can adjust the maximum mechanical advance inside the distributor (no timing limiter plate needed) and you can adjust the vacuum advance with an allen wrench. Cheap, simple, complete.

70 Roadrunner convt. street car 440+6, NOS, 4-spd, SS springs '96 Mustang GT convt. street car '04 4.6 SOHC, NOS, auto, lowered "Officer, that button is for short on-ramps"