[Kenth]

Originally Posted by scott70

Checking voltage Ive got 12.2 at the batt with key on and 11.77 at + side of coil. Running Ive got 14.5 volts at the battery and 12.65 volts at the + side of coil. Will it run right with these voltages?

No, it will NOT run right with these voltages.
You need to have the same voltage at coil as you have at the battery.
Lower voltage at coil indicates the use of a resistor in harness.
HEI/DUI/MSD do NOT use a resistor in harness.

Again, install a single relay and use the original ignition lead to control the relay.
On relay post 30 to the battery via 15 amp fuse, post 85 ground, post 86 ignition lead and post 87 to + on coil.

Now you´ll have full voltage to the coil.