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Bill, if it were mine I would install a single 12 volt heavy duty truck n tractor battery rated near the 1000 CCA range. Thats cheaper n simpler than the two sixes and will crank her about as well or even better than two of the six volters sold in her day. Unless its extremely cold and the engine n ignitions in poor condition, probably even a 750 or so CCA even would do the job, but them 1000 or 1050 CCA just spin em a bit better, ESPECIALLY if extremely cold. The more lead n acid n plates you squeeze into the battery compartment, the more energy you can store, and that usually corresponds to more physical size n weight. Thats why years ago the two sixes in series, which filed the box, stored more energy n cranked em longer than a single smaller 12 which, having less acid and plates, couldnt match. However, its possible with todays batteries to get a single super heavy duty 12 that could outperform two lighter dusy sixes of years ago. If you wanna go all out n moneys no object, those new spiral cell Absorbed Glass Mat (AGM)batteries like Optimal makes store even more energy in the same size, but a 750 to 1000 cca regular lead acid battery will serve you well,,,,, ,be cheaper than two sixes,,,,, ,,plus with the two batteries one could go bad and you gotta spend more money again. It will be fun to hear other opinions, but I say go with a single 12 volt heavy duty truck n tractor battery at least 750 up to 1000 CCA. NOTE its important to lash the battery down tight so she dont slide around n bang n shock n bump which can shake lead material off the plates that settles to the bototm n may short out. Good luck n God Bless John T in Indiana
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