Lugs not staying tight

mopwr2004a said
go to the nearest NTB or Discount tire and have them check to make sure you have the proper lug nuts for the wheel you have on the car. what year is the car. is it only one side of the car this happens on? I always had a problem like this on my 68 charger with the left hand thread wheel studs.
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It's a '66 Valiant. I'm not sure I trust NTB ... Had a bad experience a few years ago. It does seem to be only on one side, now that I think about it. I'm going to get a torque wrench from Harbor Freight and get torqued correctly first.