FE and MEL engines share the same flywheel bolt pattern so the flywheels will bolt up between these two engines. The 1958-1960 MEL bellhousing bolt pattern is the same as the FE. Starting in 1961, the MEL went to a different bellhousing pattern in order to relocate the starter at which point the FE bellhousings will not work and still have a starter bolt up to the FE bellhousing. LYB and Y-Blocks both have their own individual and unique flywheel and bellhousing patterns so they are not compatible with the other engines. I’ll add that the FE flywheel will also bolt up to a 460 but the 460 also uses a different bellhousing bolt pattern than the FE.
The 1958 thru 1964 FE’s use a 153T flywheel while the 1965 thru 1976 FE’s use a 184T flywheel. As a general rule, the earlier FE’s can be converted to a 184T flywheel as long as the ’65 and up starter is also used. But the earlier FE flywheel cannot be used on the later model FE’s due to there not being enough room for the earlier ‘pull back’ bendix starter in the late model bellhousings.