For the sake of strictly finding TDC, you want the degree wheel and pointer to be as close to tdc as can be when you start the process. Install your piston stop so the piston will come up just shy of tdc and get your number on the wheel, then rotate the crankshaft the opposite direction back to the piston stop and get your number on the wheel. Note-Your number being so high is because your piston is so far down in the hole with the piston stop set up the way you originally had it. Your shooting for the pointer to be at exactly zero on the degree wheel when the piston comes to true tdc with the piston stop removed. So, when you install the piston stop so the piston is closer to tdc the numbers you see will be smaller on the wheel in each direction. So if by your numbers you went one direction and came up with 82 degrees in that direction and then rotated the opposite way to the piston stop and your wheel was then sitting at 84 degrees. (i'm assuming you were 82 degrees and then 84 degrees respectively to come up with 83 from your math- 166 right?) that tells me your pointer was 2 degrees off because of the fact it was 82 one way and then 84 the other, so you only need adjust the pointer half that distance, or ONE degree. so adjust the pointer that one degree to 83 degrees on the wheel and don't touch (loosen or adjust) the wheel. Now with the pointer moved that one degree from 84 to 83, if you rotate the crank you should now come up with 83 degrees in either direction. Right? If you're with me so far.. This shows you have located the wheel in the correct relation for true tdc. If you did correctly, then NOW if you remove the piston stop, Zero degrees on your pointer/wheel should be exactly TDC on both the piston and the degree wheel. And you can double check that with your dial indicator, if it's correct, then you can proceed to degreeing the cam to check it's installed location. Hopefully that makes a little better sense now?