i have a 1958 570 that got a super motoer installed in it in 1965...i purcahed the tractor from my grandfather in 2001 he had just retired from farming with it ....it had according to him 19,000 hrs on it and was getting pretty tired ... i have overhauled the motor and pump ...it runs well but am upgrading my farming a bit due to aquiring more ground and have been told there is a motor that will fit in my tractor that is around or over 100 horse?? wondering if this was true and if so who might have one for sale or where i could send my tractor to get one installed?? i would grealty appreciate any help anyone could give me on this