Thank guy's, I looked at the shop manual charging and also found a picture on Dead nuts on" but it's of an alt. with dog bone harness.
The harness I have is from Alloy Metal Products 67-68 big block w/o tac. has 4 wires and the shop manual shows 5 wires for the 65 amp alt. Should the harness be a dog bone style for a 390 engine?