What are you folks using for a high outout alternator in your hotrods?

I am running that same alternator in my car. If I had it to do over again I would probably go dual groove pulleys as it gets squealy at times with bigger draws and the belt is about as tight as I like it. In addition to the fans, fuel pump etc. I have to have a stereo in my street/strip car to remind me of the "real" street racing days.
Luckily I have not had that issue. I had an 8 track hooked up for a while until I realized I was bored with most every genre of music aside from a well tuned v8. As far as tension is conceened, I'd like a repeatable, affordable method of checking belt tension.