I had an International 184 for a few years and recently sold it. It was an updated version of your 154. There are a few things I learned about this line of tractors. First the PTO turns the wrong way for standard equipment. It was designed to work with a limited number of implements made just for these tractors. The PTO clutch on these engage with the lever to the left of the seat. They require frequent adjustment. The 154 is only 15hp so it is fairly underpowered for its size. The C60 engine in this tractor dates back to the 50's. It should have a IH carburetor. My 184 had a Zenith carburetor that was a little better. There was a group on Yahoo that catered just to the 154, 184, and 185 that was very helpful when I had mine. It may still be up and running. If you have any specific questions let me know.
Eric