what is the difference between a 2bbl bbd for a 225 vs a 2bbl bbd for a 318 and will the 318 version work on the 225 if they are in fact different. any info would be greatly appreciated.

there is info on that ,don't remember where I saw it ....the choke linkage is diff....yes it will work

do you know if the jetting is different

There are differences in airflow, jetting, calibration, and (choke) linkage. Some of the V8 carbs work fine on slant-6 installations — notably the ones without holes in the throttle plates. The ones with a hole in each throttle plate tend to make it hard to achieve a correct (low enough) idle speed. The choke linkage hookup difference isn't too hard to work around. Many (myself included) have made the 273/318 2bbl carbs work just fine on a 225. The factory was very vocal about not making this swap, but they had Federal new-car emission certification violations to worry about. Carburetor operation and repair manuals (and some training movies) are posted here for free download. The BBD material is very extensive and detailed.

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thank you for the info