It's best if the additional ground wire goes directly from motor to the engine. The complete current path has to be considered and the ground path is as important as the positive voltage feed to the motor. It might not make much a difference, but any gains will give a few more RPM to the motor. The bolts holding the A/C box in place suffer from 45+ years of accumulated corrosion between bolt and body. Then the remainder of the return path has to go from the body back to the engine which introduces additional resistance at each connection. A good solid 10ga wire from the motor case to the cylinder head works best.
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Mick Batson
1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon in progress.
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