Some info says how easy or one wire hookup about wiring an HEI to your truck and little about the related starter. Most times the starter does not enter into the info. The original wiring has a Bypass wire from the plus side of the coil to the starter 'R' post. This way the coil ''only in start mode'' has full 12volt positive at the coil. This standard wiring also has a resistor allowing about 9 += volts to the std. points dist. /coil during operation.
When wiring for an HEI a larger size wire 10-14 ga. should be placed to the HEI 'BAT' from the key switch ignition post and remove the resistor wire. I have also found notes on eliminating the 'Bypass' wire from 'R' to coil when installing an HEI.
Comments please...
Then we can talk about the relay for this circuit.
jim

Gooday
Jim

small wheel moves by fire and rod,
big wheel fires by the grace of god,
everytime that wheel turns round,
bound to cover just a little more ground.