duddygoober,
1954-1962 235 or 261 are the most desirable engines for 216 replacements (unless someone wants to stay original). Depending on what vehicle the engine comes out of, you might need to swap/replace motor mounts, bell housing, flywheel, starter, water pump, thermostat housing, and/or exhaust manifold.
As Brian suggests, for more information look through old postings throughout this forum.
Good luck to you and your daughter.
Tim
