Jordan, the motor in your carrier is the proper style for it. That's the only kind they put in them.
If you go to overhaul a 221 ci flattie, the 37 and newer used replaceable main bearings where the earlier ones had poured babbit mains. If the motors weren't rebuilt at one time, they have the dual faced rod bearings too which makes the motor more expensive to rebuild. As for cracked blocks, the cracks that form radiating from the head bolt holes don't matter. It's the ones in the valve seat area that turn the motor into a boat anchor.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set
1940 Cab 11 C8 cab and chassis
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1940 Cab 11 F15A w/ Chev rear ends
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1942-44 Cab 13 F15A x 5
1942 cab 13 F15A with 2B1 box
1943 cab 13 F15A with 2H1 box
1943 Cab 13 C8A HUP
1944 Cab 13 C15A with 2C1 box
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