mopar 69,
I am not using a "fuel cell" but a fuel tank made for a cj-5. I put in a early series cj-5 jeep plastic tank because I DIDN'T want to change the filler position. I am only running carbs so this tank is not made for fuel injection but you could probably get one for FI. The tank was only 125$ but I also bought the jeep skid plate to mount tank with. Check out my photo album.
My only regrets so far is that I didn't take into consideration of going to FI later and if this tank would work. There is no baffling in the tank. The biggest pain in the ass is the vent tank on early Z's and making that work with the tank.