I've got these heads on my Camaro, and I'm using the stock Camaro accessory mounting. My alternator is in the stock passenger side position. I have the alternator mounted to the bracket in the factory manner, and at the back of the alternator I ran a small bracket from it to the front header bolt. I just scoured a junk yard and pulled anything that looked like it would be the right size. A little tweaking in the vice and elongating a couple holes got the bracket where it needed to be. The alternator feels stable, and in 10 years I've never thrown a belt.
If I think of it I'll try to snap a couple pics next time I'm under the hood.