[Steeveedee]

You want a fat and sassy wire to the power on the HEI coil. You can also buy that pigtail mentioned at Autozone or O'Reilly's. Also, as has been mentioned, look for an IGN Unfused connector. When cranking, the ignition switch sends power to the starter only, in this year truck. In it's original configuration, your truck had a (yellow) wire coming from the the "R" terminal on the solenoid that fed the coil power during cranking. That blue wire has enough resistance to give you grief, as has been noted. It's entirely possible that that blue wire is fed power through the factory resistance wire. I've seen that. The vehicle runs much better when the ignition gets enough 'trons.