I don't have any alternator shops close by so I made a bracket out of a piece of angle iron to move the factory lower bracket forward 1/2" and rotate it 90 degrees. The key to making this work well is to keep the axis of rotation in the same place.
[IMG]http://i305.photobucket.com/albums/nn214/jfnar/68%20GMC/IMG_01181_zpsvnctq22u.jpg[/IMG]
[IMG]http://i305.photobucket.com/albums/nn214/jfnar/68%20GMC/IMG_01161_zps3llfv6th.jpg[/IMG]
It will look better when Rustoleum is applied.

'64 swb stepside (gone)
'57 1 ton
'53 phone truck
'59 swb
'46 1 1/2 ton
'68 swb gmc