The ACL main bearing set for Ford 351M/351W/400 V8 engines replaces an earlier listing and is superseded by part 5M982A-20 according to the description. It supplies crankshaft main bearings for those Ford V8 applications and is intended for engine rebuilds and bearing replacement. Refer to the superseding part number when confirming exact fitment for your engine.
ACL SUPERCEDED BY 5M982A-20 - FORD 351M/351W/400 V8 Engine Crankshaft Main Bearing Set