Standard torque for an AN-5 bolt / AN365-524 nut combination: 60-85 in-lbs.
Here's a copy of the standard AN bolt torque table 7-1 from the FAA publication AC 43.13-1B. This is your new best friend for finding standard AN bolt torques. Unless otherwise specified on the plans, everything gets torqued to these values.
Sounds like this might be a new to you -6A. If you do not have a set of plans that came with the airplane, you can get a set (in pdf form) from Van's.