I also used a Duraspark system that i converted to use on Chevy 216-235-261 engines.I used a early 1980s AMC 258 Motorcraft distributor by machining the housing and shaft to work in a Chevy 6.I am using a 2 piece dist.cap off of a 200 Ford 6. I turned the AMC dist.shaft down to half inch outside dia.so i could use a Chevy alum/bronze dist.drive gear on it.
EvilDr235
