I have a 73 K5, the engine is a 1969 vintage 350ci w/HEI. I installed a serpentine setup off an 89 S10 4.3L. The only thing I need to figure out is the alternator wiring, can anyone help? The first pic is my old alt and the second pic is the new serpentine alt (under the plug is a 4 wire terminal but only 2 wires are used). Thanks.