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Here are some threads that offer some good info on the #1409 Edelbrock marine 600 cfm carb.
My own experience on a 327F small block. At first I thought the 600 was way too much carb for a 327, and it is, but the darn thing runs well and I have no complaints after several runs now. The 600 is actually a little on the conservative size for a 427, and since the original 427 Carter was a 625, you really are NOT missing anything by going to a 600. Both have plenty of fuel capacity for the 425 cubic inches in that 427 motor. http://www.network54.com/Forum/424840/message/1190492092