Hot Rods Oldsmobil rocket I.D. help

Helping a friend sell 2 engines 1- is an Olds Rocket engine, stamped no. on block is 8A491919H
the exhaust has 2 bolts in each port.
The other engine is 291 Desoto S22. I'll be posting in the for sale next week ,Thanks for any help.

 

List from the late DON_WOW
1949--8A1001 TO 8A193864 H PREFIX=HYDRA MATIC
1950--8A194001 TO 8A568689 H PREFIX= HYDRA MATIC
1951--8C1001 TO 8C287312 B PREFIX= SYNCHROMESH
1952--8R1001 TO 8R214478
1953--R215001 TO R549482
1954--V1001 TO V355083
1955--V400001 TO V983275
1956--A001001 TO A385513

 

Thanks for the help F&J. Cheers