This should be a direct bolt up if you use the 216 bell housing. The only outher problem is the fan will not set in the middle of the radiator as the 55 235 used a in the block type of water pump. This can be rectified by useing a water pump adapter sold by the venders. This will allow you to use a 216 type of pump and your fan will be in the proper place on the radiator. I have seen a lot of engines that did not use the adapter and they seem to run ok with out getting hot in the summer time. Another issue is the radiator will have to be moved forward in the housing to allow for the fan if the adapter is not used. I would not want to cut the support housing if I were doing the job, they are just to hard to come by. A 54 modle motor will use the old style pump and be a direct drop in without any mods to the radiator support if you can find one.
Tom
