[raycow]

No, you have to replace the coil. My choice would be a "no resistor" 12V coil if you are going to keep your original starter, because it will simplify the wiring. Most "real" parts stores will have these for use on farm and industrial engines. The hard part will be to find a partsperson who knows what you are talking about. He will need to be a good bit older than one of the barely legal zitfaces who populate Autozone and other similar stores.

You can modify the stock generator bracket to mount an alternator. It has to be moved forward (new holes) to line up the belt and you make a spacer out of pipe to take up the extra room at the rear.

For the belt, run a tape measure around all the pulleys to get the length, and measure the top of the groove to get the width. Here again, you will need a partsperson who knows a little more than how to look up "year, make and model" on a computer.

Ray