If you go to a good alternator shop, they should be able to look up the exact dimensions of your alternator, and cross-referrence a newer 100-amp unit that will bolt in place. If you bring your alternator with you, it will allow them to double-check the sizing, as well as put your pulley on the new alternator (the new unit will have a serpentine belt pulley, not a v-belt pulley). The only modification that you need to make, is to buy the newer (weatherpack-type) plug and splice it into your wiring, in place of your original plug. The alternator shop should have plugs for a few bucks. You might also think of running a new charge wire, in parallel with your existing wiring - just buy some 10-ga primary wire, put a #10 ring on one end, bolt that end to your alternator, and run the wire back along your inner fender (with the other wiring and vacuum lines), across the firewall, and down to the starter motor (I ran it inside the existing split loom, when I could, and especially on the run down to the starter). Cut to length (mine ended up being around 7 feet, total), and put a 3/8" ring on that end. Attach it to the stud on the starter (the one with the big ol' battery cable going to it), and you won't have to worry about the increased amps possibly harming your old wiring.
Total cost, including alternator, plug, wire, ring terminals, and solder-filled heat-shrink crimps (neatest thing since sliced bread, for attaching that new plug), came to about $125.
Joe
