64 rambler 195.6 alternator

It's easy enough. You will need to get or make a bracket to the block.

https://alternatorparts.com/alternator-brackets.html

You need the A200 bracket ($39.95). It's fully adjustable and will bolt onto the generator mount. Or fab something similar. You can find them on e-bay, same price or more.

You might want to take the generator to a local auto electric shop. Most of the time the brushes and bushings are just worn out, and they are easy to replace. Might be cheaper to rebuild the generator. If you're running the old tube radio it will pull a lot of power, if you're converted to a modern radio it pulls a lot less. Unless you plan on adding a lot of electric devices the generator should be fine, unless you're doing a lot of idling. Generator needs to turn 1000 rpm or more to make power, it doesn't charge at idle.

I am surprised a 64 has a generator. My Classic had an alternator. Yes, easy to repair a generator with bushings, brushes and a commutator clean up. I remember they used to have something called a growler to check continuity through all the windings, or was that just for starters? Could be the regulator too that failed.

I got 'lost' and discovered a licensed 63 Classic parked on the street. No answer at the door so snuck a peek under the hood. 196 aluminum block with 10si alternator already converted and hanging high on the RH side.

On the iron block OHV a CS130 as found on an 89 Pontiac fits well with the bracket change. 

AMC used generators on base model Americans and Classics with the 196 through 65, IIRC. If you got AC it came with an alternator.

Canadian models had Prestolite (or Autolite?) alternators with 4 post regulators in 64 I believe, for both Americans and Classics. I don't know about the V-8's. The regulators are virtually unobtainable. A few years ago I think I might have found one in a NAPA master catalogue but they wanted almost $200 for it.

It is so easy today to go with a newer alternator. They charge so much better at idle than the early Delco versions, although I have read that the Motorola's weren't bad that way. At night with lights on it is really noticeable with a new style alternator. Just like a new car.