segun wikipedia:
1958–1976 FE V8 — big-block
* 1958–1971 Generation I (332/352/360/361/390)
* 1962–1973 Generation II (406/410/427/428)
1958–1981 Super Duty truck engine — big-block (401/477/534)
1962–2000 Windsor V8 — small-block (221/255/260/289/289HP/302/351W/Boss 302)
1965–1968 Ford 427 side oiler
1968–1997 385 V8 — big-block (370/429/460/514)
1970–1982 335/Cleveland V8 — mid-sized (351 Cleveland/400/351M/Boss 351)
o sea, los Cleveland y Modified son MB (no SB ni BB) por eso no calzan las campanas
fuente:
http://en.wikipedia.org/wiki/List_of_Ford_engines