This thing is absolutely driving me crazy!
The first thing I did was put the rear exhaust header and flange back onto the studs. When I put the nuts back on, the top one was a piece of cake. Bottom one was the complete opposite. Not enough clearance to get a socket or box wrench on the nut. The header pipe, cylinder head fins, and various other hard parts conspired to defeat my efforts, despite trying dozens of different approach angles and every tool I had available. Multiple trips to Ace, Home Depot, Harbor Freight, and Lowes had me trying a wide variety of specialty tools. The only combination that even remotely worked was putting a 1/2 inch crows foot wrench on the nut from the exact bottom and carefully connecting that to a stubby, flex head ratchet handle. This allowed me to get about 1/4 turn on the nut before I had to take everything off and reposition for the next 1/4 turn. Tedious, maddening, etc. Now maybe I know why that nut was only finger tight when I went to remove it!
No way I can get a torque wrench on it so I just made sure it has the same amount of thread showing as the upper nut which was torqued to specs.
What a frustrating day! Maybe tomorrow I can get back to the job of reinstalling the rest of the exhaust.