Not wanting to ruin this guys thread or sale ($40 is great buy)...but I ran into the same problem with the sling. Even with a 12' tall two-post lift, I didn't have enough room to take out the slack of the sling. The strap brackets (metal tabs for connection) fit perfect behind the rocker moldings (remove them first) and pick the car up from underneath the doors. Now, I did end up using the sling; but I had to use the rafters of me garage, a block & tackle, and the electric winch off the car trailer. After all that trouble, I then realized that I could take the arms of the lift and lift up in the same place as the straps and not even need the straps - which is a much better approach in my opinion; but you have to have a lift to do this. You need to jack up the body from the frame with three (3) 4x4 blocks on either side to allow room for the lift-arms.
here is the slack that we are talking about
You can even see we took the wheels off and set the frame on the ground. Now it would have worked if we would have the motor out, but it's still alot of trouble.
Here's the lifting points:
You can see the metal clips of the sling attached at the front and the 4x4's at the rear. With the body spaced this far, set the frame down and insert the lift arms right by the 4x4's and just lift away!
I hope this helps, CF has been a huge help to me.