A833 overdrive V8 bellhousing?

Actually it is a custom build 68 Charger I am putting together slowly. Just spend more time on A bodies vs B bodies
What would be the easiest / best way to mount an early A 833 V8 bellhousing to a later A 833OD? Is there an off-the-shelf front bearing retainer that could work? Or cut down the 833OD current bearing retainer to fit the BH smaller opening? Or open up the early 833 BH?