HEI installed not charging, need help!

Not supposed to be a blue wire on the coil. If you have a isolated field alternater ( square back ) it has 2 field terminals. Blue to one green to the other, which is which makes no difference. I dont know what aternater you have or what regulater you have. If your regulator has only 2 wires, blue and green, you would need to ground the other field terminal on the square back aternater. Still your harness will have a blue wire left with nowhere to go.
Hope this makes sense