I just used the standard adapter plates with solid motor mounts. I made my own but they are just like the ones that Car Shop Inc offers.
http://carshop.carshopinc.com/produc.../86959/C/S2349
Using those style of plates keeps the engine close to the firewall which leaves a little more room for the front accessorys. Let me tell you there is not a lot of room in the engine bay with an LS engine in there. Also with using the standard plates there is no need to trim the front cross member and the cross steering shaft clears the GTO oil pan perfectly. The only thing that concerns me with the GTO oil pan is that it hangs a little low and that the oil filter is right in the front.
I need to get some updated pics, I now have the shock towers filled in and I am running a chrysler master cylinder. Also with the GMPP intake and a cast throttle body elbow it still clears the stock hood. I just need to get some Katech rod bolts and I can set the engine in for good. Hope this helps you out.
Jared