I'm there with Tim. My 6v one wire as no problem charging my '38 at idle. To the OP's question the 60 amp will be more than sufficient unless you're planning to run a thump-thump stereo or other power hog.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.