Thanks for everyone's help. I will answer the questions the best I can. The tractor was my fathers and I purchased it after he passed. From what I remember, my father could have that idle down to the first notch. Now it needs to be about half throttle to idle. Unfortunately, before he died he no longer had the ability to think as he once did. When I got the tractor it not run and my father could not figure out why. So I don't know what he might all have tired. When I got it, I did a compression test on it and each cylinder is consistent at about 50 PSI. I was able to get the tractor running by replacing the Magneto. The one on it was not giving spark and was for a International. He still had the original Allis Mag and it was hot. I had to change the wires to match the mag, but that got it running.
I hope this helps.