Most—but not all—HEI systems have the ignition coil mounted in the distributor cap. A control module and magnetic pickup are mounted in the distributor, in
This is a nice bracket that mounts the GM HEI module to the bottom of any Chrysler V8 electronic distributor. Bolt this on and dump the ballast resistor forever! It is also very nice for use in older Mopar vehicles where you don't want to mount a large ignition box to your firewall....
Ignition Distributor for Street Fire Chevrolet V8 GM Hei, Find Details and Price about Auto Part Auto Parts from Ignition Distributor for Street Fire Chevrolet V8 GM Hei - Guangzhou Four E′s Industrial Co., Ltd
you would only need to check the power and control circuits of the coil. If the coil is getting power and it's being pulsed by its control module, the ignition coil is bad!