OK, so I made some progress . . . after using two different engine tilt units and then simply chains to hook up the engine to my hoist, I was finally able to get it and the transmission installed to the point where I am now just working on fitting everything in where I want it to be.
The original owner had welded frame mounts with a tubular piece of steel onto a set of stands, and apparently, these were designed for the thicker motor mounts than what was attached to the SBC when I got the car . . . he had attached them to the block with washers behind the mount to space it the mounts out . . . not a good solution . . .
So, I ordered a set of Moroso SBC Mount Shims . . . they should be here in a day or two; the kit includes 2 x 1/16", 2 x 1/8" and 2 x 3/16" shims, so between those, I should be able to get the engine attached to the frame mounts.
The only intereference point I had was with the existing brake booster and the left valve cover, so I'll either get an offset bracket for that, or switch to Hydroboost.
Also, the transmission seems to have plenty of clearance to the tunnel so far . . . I haven't worked on getting the angle yet, but will report back with pictures once I do.
Here are some pictures showing it close to where it needs to be in the chassis, and the clearances this engine has with the stock Camaro oil pan and exhaust manifolds--this is while using the 3rd set of bolt holes in the ICT motor mount adapters, which puts the face of the bellhousing 2-1/4" forward of the location of the SBC bellhousing face