I'd go ahead and mount the heater/AC box under the dash as a trial fit. Then I'd pull it out and run your wires. You'll be able to see it all unfold and lifting the box back in and out as you go to see how it all fits. Ductwork near the end of it all....yet be trial fitting that too..to see what the best routing is .
I studied many hours of DSE projects photos watching how they were progressing just to get a mental pic of how I wanted things to go together. Every car is different. Go for it.....and take your time....measure twice cut once. You'll do great.
I purchased a good quality crimper....off ebay.... and was one of the most vital tools I've used. One can splice, crimp, resplice, etc to your hearts content and not freak out about wiring mishaps.
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68 camaro, 572, tko
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