I called Lee Power Steering and he verified for me that all I needed was a replacement rag joint to account for the different input shaft size. Got that ordered ($65) and should be here in a couple days.
Since my Firebird had factory power steering, the pitman and idler arms should work just fine with the 85 Camaro gear box (Duralast Part 6561). In the interest of keeping things simple, I ordered an 85 Camaro steering pump as well as pressure and return lines. This should let me avoid the pressure valves and adapters needed to retrofit to the 67 equipment.
With any luck, everything will bolt on OK this weekend! Thanks again for the help all! Look forward to getting to know you guys.