I saw this on ebay and looked at it closely... its NOT a CCKW fuel pump (although what appears to be a part number ends in G501).
Here's the SNL image of the 6 valve fuel pump.. we are really only concerned with the lower casting:
NOTE the recessed areas on the horizontal 'arm', and the hump at the top of the lip.
Here's the ebay part being passed off as NOS CCKW:
NOTE the horizontal arm is solid, there is no hump at the top lip AND the small gusset at the horizontal arm/flange is on BOTH sides (ie there are two small gussets, not a single one).
Note the arrow.. this is a boss that is tapped (or not, depending on the application) and the sneaky seller omitted a clear shot of it
Here is a photo of the G744 5 ton gasser fuel pump.. I'm not gonna look for a better image... this is conclusive enough:
Here is another M54 gasser fuel pump:
Buyer beware... or at least ask me