Since they only built 1040 fuel injected corvettes out of 6339 in the 1957 model year, a restorer would probably give his left brain to get his hands on a doghouse with the correct part number......and leave you with $$$$ to build a 383 type motor. I have owned several 57 rochester units but it was before they were valuable. Most folks removed them from their car because they were too difficult to tune and keep tuned. The stock Rochester will not work with a 383 without some major tuning changes.....100 more cubic inches to feed.