Those are of course conservative military numbers the 3.25 inch bore civilian DJB which does not have an oil cooler is rated at 11.6 BHP (I don't have the number on the closest civilian cousin to the MEP 002a, the DJE with 3.5 inch bore), and the civilian DJC (close cousin to the MEP-003a, again no oil cooler and 3.25 inch bore) is rated at 21.8 BHP, and the 3.5 inch bore water cooler RDJF is rated at 32 BHP which is likely a little higher than the MEP-003a. All these numbers are at 1800 rpms.
Ike