Dan,

The nut will unscrew the whole tensioner. The allen screw is for resetting the tensoner's piston. I believe there is a crush washer that seals the tensioner to the block. You don't need to loosen or remove the tensioner to remove the cam sprockets. Just remove the four bolts holding each sprocket to the cam and then remove the cams. Be caureful with the sprocket bolts as they could also be dropped down the front of the motor. Shove a few rags down there so nothing gets by.

There are just a bunch of bolts that hold the power steering bracket to the block. Both on front and side of the block. I think I just used stubby sockets with swivels to get at some of them. Where are you having problems?

Tinker