When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
C'mon there pete- these wiring diagrams HAVE to have so many wires on them it's near impossible to track one wire thru them. GEEZ, anyone can follow that one!!
77 would not need or have the dist wire from the starter. The purple wire comes from the neutral safety switch and goes to the s terminal on the starter.
Your 71 originally had 2 wires to the + side of the coil. One from the starter "R" terminal and one from the ignition switch. THe one from the switch has a resistor in it and can't be used with HEI. The one from the starter suppled a full 12v to the coil for engine start and is normally not powered, although it does have 12v fed from the coil+ connection when the key is on.
HEI requires a 12 ga wire from an ign source such as the ign tap in the fuse box. Do not use the resistance wire that was powering your old coil because it won't provide enough power to the hei. As Tim said, the other coil wire that used to go to the starter R terminal is not used either.