Easy swap, bellhousing and flywheel will bolt right up.
The timing plate may not be drilled for the truck front mount but that is easy to drill.

On another note, a Fire truck in 43 most likely had a splash 235 originally. Going to a 216 will be going backwards on power.

If you are not worried about keeping the original engine I would recommend a full pressure 235 or a 261.

Just reread your second post. Engine is no problem, going to a 51 transmission would be a problem


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