1972 440 holley carb question

[1958300]

Can anyone tell me the difference between a holley 6253 and a holley 6160? The 6253 is listed for the 440 HP auto, and the 6160 is listed for a 440 auto. Is there any significant difference between the carbs? They look almost identical to me. What is the cfm rating of the 6253 and the 6160? I have both carbs, and I want to use the correct one on my 440 rallye auto N96 car. Appreciate any help.

[Chryco Psycho]

it may have just been a slight difference in air bleed or jet size to do with the cam used in the engine , I believe both are 600 cfm which really is too small for any 440