I have a 1953 Chev 3100 PU with a 56 235 engine. I plan to rewire the truck soon, currently I have a older Altenetor with an exteral regulator that I would like to replace at the same time. I see from other posts that the Delco 12si altenator is one people have had good luck with. When shopping for new wiring harneses it seems that you can only get a 12 volt harness for altenatores with internal regualators. Is the Delco 12si the altenator I should use and will it mount to my bracket?