Back in the 80's I bought my 43 H from someone the family knew for a long time and I know he was the orignal owner.Last year I found out the govenor had been changed to a 3 weight govenor and the tractor had a gas manifold even though there was a starting tank on the tractor for burning distillate. Are these the type of changes someone in the 50's and 60's would have made if they were taking the tractor to a tractor pull? I know the little town he was in used to have a carniville with a tractor pull back in the 60's. I also know the tractor made several trips to the local watering hole afer his wife took the truck keys but I don't think anything was modified for that!