[68c10airstream]

Mongocanfly is pretty much spot on with his suggestions. I'll add this info for your consideration; trailblazer ss compressor has the 2 lines at the manifold on top of the compressor are indexed front to rear, and clocked outward some, where as all others are indexed left to right which requires notching the frame rails. When i get to installing my 68/ls ac system this is what i will be using. I mocked mine up and it is close between the compressor and crossmember and my 5.3 ls sits very close (1/2") to the crossmember using the "F" body pan. I believe dirty dingo sliders combined with the 60's and possibly 70's mounts will hit the back of the compressor. I used the 2001 organ donor mounts and fabbed up brackets, thus eliminating the small block perches that go over to the side of the frame as these are usually trouble for headers. If i was to retrace my steps now i would get corvette mounts (look like hockey pucks layed flat) and corvette brackets as this setup will move the mounts inward and rearward completely out of the way.

When my compressor finally gets installed and if it rubs the crossmember i will notch it accordingly which bothers me less than notching the frame. My headers are shorty's for a 68 and newer nova, 3/4 length and there isn't a 68 small block perch in the way either, just kinda all works out.