if you are putting a 6 pack on a 383 under a airgrabber hood..
you will have height issues with the aircleaner to the hood
fit as the 440 engines will sit a bit higher
then a 383 engine will.
they had 2 different 4bbl airgrabber aircleaner versions for that reason.
they don't have 2 different 6 pack aircleaner versions that I'm aware of as they only were used with a 440 from the factory.