I fitted one to a KE35 and had to extensivly modify the sump to clear. The block is about 25mm wider than a 4k/5k so mounts had to be modified as well. Everything else fitted with no problems.
The mounts shouldn't be an issue to fabricate/modify. How "extensive" is the sump modification needed? Obviously a 4 or 5k sump will get hammered by the cranks' extra radius?