For a point of historical accuracy, Chrysler, Dodge, Plymouth, and DeSoto DID in fact have their own engines; as did the Ford Motor Company. The various divisions started using each others engines much earlier than GM (passenger); although GM trucks used various modified passenger division engines as early as the 1920's.
Even after the various Chrysler divisions started sharing engines, the divisions had some say as to accessories. Example, Plymouth used the "price leader" Carter BBR series on their 230, while Dodge used a much more expensive, and much superior Stromberg on their 230.
As to the "GM corporate whatchamacallit": If you took one of these, painted it blushing orange, and added a carburetor; and then set it side by side with an SBC, methinks it would difficult to tell the difference.
You know the selection of orange for the SBC was an early example of ergometrics. The SBC knew it wasn't good enough to be painted Pontiac Blue, and blushed Chevrolet orange. It was painted accordingly
OK, you guys can go back to arguing again.
Jon.
__________________
"Good carburetion is fuelish hot air".
"The most expensive carburetor is the wrong one given to you by your neighbor".
If you truly believe that "one size fits all" try walking a mile in your spouse's shoes!
Owner of The Carburetor Shop, LLC (of Missouri).
Current caretaker of the remains of Stromberg Caburetor, and custodian of the existing Carter and Kingston carburetor drawings.