I have a 53' 3100 series that I have the front end sheetmetal off of so it was easy to check for the information you desire.
First, I cannot guarantee the accruacy of this information as it is not done in any real scientific manner. I had to use some line of sight but I'm a good shot so my "line" is pretty good.
Secondly, I can't say if your 50' model is the same as my 53' but its a pretty good bet that they are as most everything else is the same.
I used a mechanist protractor and had to rely on the front spring as being a straight reference point for straight ahead. The frame is not square and tapers a bit so the springs look like the best reference. Turning the wheel all the way to the left indicates a 40 degree angle to the spring edge. Turning this same (drivers side) wheel all the way to the right indicates a 19-20 degree angle. Frankly this surprises me as I thought it would have been at least 28-30 degrees. My shop manual has little information except that the 3100 series in 52' had a 28.24 ratio steering box. I didn't see the lock to lock info but I'd guess it is 3+.
Again, this is general information using some KY windage and I only hope that it is of some help to you. Good luck on the project and you may be the one advising me before I'm finished with my ordeal.
