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Should be a set of numbers on the front of the choke horn, just below the air cleaner front top of the carb.. there will be one that starts out LIST-xxxx thats the number you need to get a kit or anything for it, even ID the size with that #
What is this carb off of? I have a list of Holley carbs & I see no 4749-3. Are you sure you have all the numbers? Post a picture. There is a 4742, then you go to 4776 but these are all 4150 Holleys.