1989 Chevrolet Camaro swapped motor

I'm finishing up my car and I'm looking for what kind of alternator to install. I have a 75 vette 350 swap that's installed and I don't know what alternator I would need. Also my belt tensor bracket from the old motor does not fit since this motor doesn't have ac. Where would I be able to find the belt tensioner bracket for the 350? Since the original had r12 ac and I don't use ac at all I took out the unit. You guys could help me out id really appreciate it! Thanks!