best racing ign system.

There are HEI dists now being made for non-GM engines. Not aware of any company making Chrys elec dists for non Chrys engines. Therein would lie a story....
You want to run the biggest plug gap your ign system will tolerate without misfire. It might not make any more hp at peak rpm, but the engine is not continually running at peak rpm; it has to start from idle....& then proceed through the rpm range to peak rpm.