If it's cast iron it should fit large and small flywheels. The sm420 will fit. sm465 will not. Don't know what bell housing he has or what tranny he wants. Your parts may be a good option.
Mr. Plum: The 420 and 465 have the same GM 4 hole bolt pattern and input shaft dimensions except the "bearing retainer" diameter is 4 11/16 on 420 and 5 1/8 on 465 so check the big hole in any bell housing you decide on vs what trans you decide on. There is an adapter ring available for 420 into a 5 1/8 hole. If you use an aluminum bell housing, some do not accept the 168 tooth FW.
Last edited by bartamos; 02/03/2021 4:41 AM.
