alternator misalignment

[old cool]

My GMC has an inline 250 six. The crank pulley has two grooves. The truck has no options. So, question one is: are double grooved pulleys standard even if truck comes without ac, ps, etc...?
Second question pertains to alignment of alternator pulley and crank pulley. The upper alternator bracket is flat and arc shaped. (I've seen upper brackets with "L" shaped bend) The bottom bracket connected to block only provides so much slide for alternator. Is bending, shimming, or modifying a bracket a good opition?
Lastly, my alternator belt is running off the outer pulley groove instead of the groove closest to block. I don't feel the upper or lower bracket are giving me much choice. I feel like I'd rather be running on inner side pulley even if just for appearance.
Anyway, back to most important point, is/are there simple solutions to aligning a belt, and an alternator that doesn't square up with block. I need some good advice before I ream out the bracket holes and use shims to align.
Thanks in advance for tips.