I'm looking at a book I have, called, High Performance Ford, Engine Parts Interchange.
It lists 351C block numbers as, DOAE-D two bolt mains, DOAE-C and D3ZE-A four bolt mains.
In another section it lists 351C casting numbers as 70-71 DOAE-A,DOAE-C,DOAE-E, DOAE-G, DOAE-J, and DOAE-L, 1972-74 D2AE-DA, all as Ford Part # DOAZ-D, two bolt main block. Shows 351C Australian as Ford Part # D6HM-L, does not show any casting number.
1971 351C, DOAE-B, -D, -F, -H, four bolt main.
1971 Boss 351C, D1ZE-A, -B, Ford Part #D1ZZ-D, four bolt main.
1971-74 351C Cobra Jet, D2AE-CA, Ford Part #D1ZZ-A, D3ZZ-A, four bolt main.
1972 351C High Output, D2AE-EA, Ford Part #D1ZZ-D, four bolt main.
Thats all the numbers I can find for these engines, hope it helps.
DT