I got the diff in tonight and got the jack stands under it. The pinion flange is sitting at 4 degrees...pointing up towards the firewall. This is good news for the trans as it will be point down 4 degrees which gives me about 10mm of clearance to the tunnel. There was much rejoicing in the garage tonight!!
I didn't get the two trans mounts rate checked today due to sudden work related emergencies displacing government jobs.
So I bolted the GM FS truck mount in and took a base measurement of the free height of the mount then jacked up the trans by the mount. I measured again and recorded zero deflection. Since the engine is front heavy there isn't much preload on the mount. I can easily lift the tailstock with one hand so the lack of mount deflection isn't shocking. Looking at the design I think I'm going to go with the GM mount over the S10 one from Rockauto.
The GM P/N is 22865396. I will try to get a vehicle line-up. Alternately you could use the mounts that Bianchi suggested. They are restrained which is definitely a bonus but I don't think it's really required considering the massive torque that the 2litre puts out.
Here's a comparison of the two mounts. The S10 mount is on the left; (see pic at the bottom of the post...not sure how to move pics in the new forum format)
You can see the rubber legs of the S10 mount are nearly horizontal which makes for a softer mount and more susceptible to deflection and sag under heat and load. The FS GM mount is on the right and the legs are closer to 45deg. This will make the mount considerably stiffer. I can also deflect the S10 mount by hand. Not the case with the GM mount.
Once I find my tape measure I'll get the driveshaft ordered and start on the cross member. I think the cross member will be pretty straight forward but will require a little bit of creativity. I'll get some pics of where the cross member will eventually sit and post them.
Bianchi...I seem to remember you saying you could use the original cross member. I'm assuming you need to cut the clevis off. Any pics of what you ended up with?