Different from both ends......
Bruce is right on target....
Far easier to find a CMP bell housing....... 0.05 cents each in Ontario and the SM420 will bolt on directly....... it would silly to pass the convenience of the synchros on the SM420.....and it's a straight bolt on.
You will in all probability need to find and adapter plate to instal a 216 water pump which will not only shorten the lenght of the engine but will also better align the fan blade to the center of the radiator......and to the changeover ofo the water pump BEFORE you install the engine in the CMP as you will require to drill and tap into the engine block......sounds scary but not so complicated.
We built a small drill guide using a flat plate and a piece of tubing welded to the plate.....bolt the plate on the block using the other existing water pump holes and drill and tap the hole by drilling from inside the tube as a guide.... it will insure near 90 degrees.... I used a heavily greased rag stuffed inside the engine block to catch the metal shavings from behind..........mark your drill bit so you ONLY drill deep enough to reach through the water jacket BUT not into the cylinder casting. Use pipe thread sealer on the bolt threads .....
When you install the pump with the backing plate you may have to use some washers as shims if you find that the new pump does not fit perfectly flush even with the block leaving a tinny gap that may cause some distortion when the pump bolts are torque properly........ not all blocks are exactly the same but on some we had to use washers made thinner with a grinding wheel......
I have a picture somewhere and will try to dig it up......
If you buy an adapter plate make sure you do a good tracing of its shape in case a friend in EU had a need for one......very easy to copy in 3/16 flat plate......
Cheers
__________________
Bob Carriere....B.T.B
C15a Cab 11
Hammond, Ontario
Canada
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