74 duster electrical problems

Hello Guys.
I need some suggestions I'm at my wits end on this one. I have a 74 duster was a 6 cyl now a 360. Car was rewired 3 years ago with a painless wiring kit. Ran fine for the last 3 years. A couple of month ago I took it to the strip and after 5 trips down the strip it quit on the coast down after the run. long story short couldn't get it started. Had it towed home. On checking it had tripped a 70 amp breaker I have installed in the system and had burned up my ballast resister,electronic ignition my dash gages 2 of the tail lights the relay to the electric fan and some some other things.
Replaced the electronic ignition and resister ignition again. and gages. ran a bit and burned up the ignition again. Finally I found the voltage regulator burned up. Replaced everything again. New resister new electronics new regulator checked the coil coil ok. new relay for fan new alternator. Car started but sounded like the timing had jumped. It kicked back on the starter. Car ran like crap and quit again. New plugs and new plug wires and new rotor and cap this time. Volt meter jumps wildly also.
Any ideas? The only thing I haven't replaced is the coil and dist. both are only a couple of years old and car only sees a couple hundred miles a year. Thanks