[Vwdiesel] More Dasher?

[William J Toensing]

I finally got my 1981 Dasher diesel wagon back on 4 wheels & ready for a test drive, once I get proof of insurance so I can renew the license plate tabs. 
1) Is a torque of 150 foot pounds  OK? One book says 149 pounds (VW manual up to 1979) but the Bentley says 180 foot pounds. However, my torque wrench only goes up to 150 foot pounds. I advanced my torque wrench to the maximum which might have taken it to 160 but can't really tell.
2) How many cans of R-12 does my A/C need? I put in 2 cans but no evidence of any cooling but my A/C leak sensor did not tell me of any leaks. I have a few more cans but don't want to waste any. I evacuated the system before installing the two cans. I have installed a new A/C compressor as the prior one was frozen.
3)I replaced the nut on the left front wheel but did not on the right side since I had previously loosened, but did not remove it. Should that one be replaced too?