What size alternator

If your battery stays charged, your alternator is fine. For the first few weeks, put it on a charger every Sat morning and see if it gets to "full charge" in 30 min or less. If so, it is staying charged. I think the square-back alt will prove fine. If you decide you need more, PM me for a rebuilt 110 A alternator I bought but won't use because it turned out to be a beast. You can see on Autozone. I think they put them in some 70-80's trucks, maybe for a tow winch.