That PS pump bracket is just like the one's used on most all 67-68 Camaros, Impalas ETC. That bracket should work fine with the subframe.
It bolts to the two holes in the fromt of the block, then the arm bolts to the front top motor mount bolt.
Just use a 1/4' longer bolt in that hole.
My 1967 RS/SS has the same setup. You should not need to move the alternator either.
[img]http://www.thevirtualgarage.com/bboard/ubb/biggrin.gif[/img]


Kelly
1951 Chevy 3100
1967 RS/SS Camaro