I have a '67 Fairlane that was a bare bones car originally. I'm not sure of the amperage but I'll be running the alternator from a '94 F-150. I've added an electric fuel pump and will be installing A/C. I'm not planning on electric radiator fans. The original wire feeding the fuse block looks to be no larger than 12 ga. at most. Will this be sufficient or should I be going to a larger wire?