What is the difference from a 216" head gasket and a 235" gasket? pictures would be nice, thanks MB

Depends on what year the 235 is for.
The 1941-1949 235 uses the same head gasket as a 1937-1953 216. It uses 15 head bolts
The 1950-1952 235 has its own head gasket. It uses 15 head bolts.
The 1953-1962 235 has its own head gasket. It uses 18 head bolts.
Thee above does not include late 1951 and up Canadian 216 engines.