A 1954-62 235 engine will bolt up to your existing bellhousing and require a minimum of adapting, mostly in the area of the water pump and maybe a little modification of the front engine mount. Obviously, another 216 will fit, or a splash-oiler 235 from about 1940-53.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!