The rule of thumb for wiring using aluminum or CCA is you need to go one size larger than with copper. This will eliminate any concerns about voltage loss, or current carrying rating. So if you need a #8 you should use #6. For a battery cable from trunk to starter I'd use 2/0 CCA.I don't see an electrical section so I'll ask it here, about all the wiring you see is CCA, how much do you loose on long runs with this wire. For an example, say you need to run an 8 gauge wire to the rear of the car, 10 or 12 ft, how much drop will you see? Fans and fuel pumps would be affected more than head lights and such and I'm going to need several feet on this car. I'll get a universal wiring harness for all the normal stuff but I'll have 2 electric fp's and a big amp alternator which will have to be wired through the kill switch.