mounting alternator

[69-350]

well, the other day on a trip to my friend's house only a couple miles away, when I went to fire her up to get back home, battery was dead. So I called a bud up and we jumped my battery, and figured out my alternator wasn't spinning. Anyways, so I crack the ONE BOLT that holds it on the bracket, and as I'm tightening it to make sure it doesn't wiggle loose again and slip the belt like it just had, I snapped the head of the bolt off. oh crap. then my buddy's folks show up, and his dad makes a trip to the hardware store and buys me a nice long bolt. problem fixed.

Which leads me to my question. How should the alternator be held up? Shouldn't it be more than one bolt? I think my 350 came out of a mid-80's, and the bracket for the alternator doesn't look too grand. It's held on tight enough by I think two bolts, and the alternator alternatly is held on by one bolt through the large slider slot in that bracket. Isn't the dang thing suppost to be held up by another bracket or something? Maybe some explanation or pictures would help me out here, if you have any of your alternator mounting. Thanks, Mark.