Thanks for all the hints thus far....a couple of reasons I was going to go with painless was because they seemed cheaper and I can get the whole wiring set for my car for $429.99. Here's summit's description of the harness:
Complete from headlight to taillight.
Painless Performance 12-circuit Mopar muscle car Wiring harnesses consists of a new chassis designed harness for use on 1966-76 Mopar muscle cars. These harnesses includes a pre-terminated fuse block and high temp, color coded wire. Complete wiring from headlight to taillight.
A/C, heat, brake lights, coil, horn, emergency flashers, dash instruments, headlights, radio (constant and ignition hot), turn signals, wipers, dome light, tail lights, third brake light, charging and starting all included.I also spoke with a guy at painless who owns a challenger and he said to go with Painless part# 10127 vs the other one because 10127 doesn't have the bulkhead connector, therefore reducing the amount of connections that could wear out again in the future. He also said they make a block-off piece for the hole-to-be left behind from the bulkhead connector....but he said there were only 2 things that I would have to do that may give me small trouble which was wiring the switch for the heater and lights.....other than that he said it was pretty easy. He didn't sound like he was pushing me to buy so I think he was being legit.
I called Evans and I think they said their's is on back order too...but I'll double check that.
At any rate, here are my options (from what I can think of):
A.) cut back the existing wires, replace them, and put it all back together and hope nothing else goes wrong (which 90% tells me nothing will go wrong). Price: $40.00 for wires and connectors at most.
B.) get just the dash harness, new, and replace just that. Price: $640.00
C.) Get a used harness from ebay and configure it to work. Price: ??, conversion kit for ralley to non-ralley dash: $29.99
D.) Get the painless wiring system for my whole car, use existing connectors where I can and make it work. Price: $429.99
E.)
?
I'm to the point where I want to do this and do it right, even if it's just replacing the wires and hoping it all works. Any input/suggestions would be greatly appreciate.