What is the highest amp rating alternator I can use on a 1970 Dart

When I rebuilt the electrical system in my car I installed a 60 amp alternator but I also replaced and upgraded everything in the electrical system to handle it including doing the ammeter bypass. I tried it first without doing the ammeter bypass and the fusible link connector got hot enough that it was starting to melt and I don't have much that pulls hard on the system. Just a MSD6 box and puny 200 watt stereo. As mentioned the factory wiring and design won't handle much more than stock without upgrades. Unless you have a real need to upgrade (you've added high amp draw devices) I'd leave it as is since you say the wiring is in good shape. JMHO