OH! When I bought my 49, its needed the engine rebuilt right away. The guy at the corner who is an old fashioned mechanic knew by looking at it that it was a Continental engine as he had seen many over the years--some tractors had 4 cyl Continentals, but the Massey and Massey/Ferguson used the 6sixes, some being 244 CID (different crank, won't interchange in a KF) but also all the industrial engines--Lincoln welders, Clark forklifts, mobile on trailers compressors, generators, irrigation pumps. He just asked me for my manual, noted the piston and rod sizes and displacement, and that was all that was needed. Listen, almost ALL the parts necessary for a complete rebuild were on the shelf of a small town parts place a few miles away. The rest came next morning on the truck from the closest warehouse 100 miles away. Pistons, full rebuild kit, new valves, everything. Any place that does tractors, or heavy or industrial equipment and has a few people older than 22 will know what you are talking about. Continental=KF=M/F=Checker=Clark=Lincoln=etc
This ad on Ebay seems to be for the right stuff, just check the workshop manual. I think I had 20 over just like these put in.
Another BIG piece of GOOD ADVICE for anyone needing stuff done on your Kaiser or Frazer or Studebaker etc. You want someone who understands zerk fittings, grease guns, flat tappets in old engines needing oils with Zinc & Phosphorus for sacrifice coatings (like ZDDP, or some RACING oils) KING PINS etc---save yourself aggravation and $$$ and check out a place that works on big trucks and heavy equipment. A lot of that type of stuff still uses king pins and zerks and they understand it unlike some more modern garages. I get lots of stuff done by a big tire shop which does transports (they even have split rim equipment and people properly trained to use it safely) and they know all about king pins and old style suspensions and drum brakes and drive shafts etc.