75 1.8 Alternator Belt, Can't keep belt on pulley, runs sideways, can't get at alt Options

[Donaldo88]

Newbie. This looked like the correct named forum, but I see stuff about events, Subarus, and Impalas???
I got a long-stored low-mileage, 914 1.8, still FI, last year. Haven't driven much because of recurring problem with alternator belt. Immediately after taking off hauler, within 40 miles, it scorched the belt. Mechanic put on new one, I wanted him to check some things that I couldn't do anyway. Then it slipped, in another 100 miles or so. I tightened without seeing it. Next it flew off entirely in maybe another 50 miles. The v-belt appeared to have run sideways because it was deformed with one edge stretched. I can't see much, but it looks like I have to drop the engine to even get a good look at alternator alignment, pulley condition, etc. The engine pulley feels rough, but the rest of the car isn't rusted much. I can't tell by the photo I have, how the pulley fastens to the fan wheel. I'm really disappointed. We had one of these new, when first married, and this was an anniversary gift to my wife. She drove the new 2.0, ( (IMG:style_emoticons/default/huh.gif) I was not that crazy about it at the time.)
Any advice out there?
Thanks,
Don