Serpentine Moves forward on A/C compressor pulley

[greenlight]

The Serpentine belt moves forward two grooves (up and over the A/C compressor pulley). We've ground the bracket to move the compressor pulley forward twice & replacing the belt too, but is still moves the same amount. It's a 67 Camaro with an LS3 out of a 2011 SS Camaro, Holley Accessory Drive System Part# 20-138. I'm open to suggestions, thank you!!

Greenlight

[minendrews68]

something's out of alignment. either the A/C compressor is too far back or it's crooked relative to the other pulleys would be my guess.

[Tsaints1115]

There’s alignment front to rear but also all pulley center lines need to be parallel.

[morrisclassic]

Greenlight,
I had the same issue about drove me crazy!
Put a combination adjustable level vertical on
the crank pulley, rotate the dial until it is level.
Lock it down. Now put it on the A/C pulley
adjust the A/C pulley to be level also. This will
align the A/C pulley at the same degree as the
crank pulley. Hope this helps
Billy