First question that I have is... Do you have the original fuel pump for the car? .. If you do, then you can have your original fuel pump rebuilt. One thing to keep in mind when buying a replacement fuel pump, is that depending on when the pump was built or rebuilt, the materials used might not be compatible with the fuels of today. Another issue is if the pump that you have is original to the car, then it also depends on how original you want your engine to be. If keeping your car as original as possible means something to you, then I would have the original factory installed pump rebuilt and reinstall it. If keeping it all original, isn't that important to you, then a replacement pump is in order. If you go with the replacement pump, keep the one that you remove, so should you ever change your mind about originality, you will still have the one that is original to your car. Usually the core value on old fuel pumps is very little.
The Carter part number is M3019 and the Airtex part number is 713. This pump fits the Cadillac 6.0L 365cid V8 and 6.4L 390cid V8 engines from 1958 through 1962. The original pump for your car would have been a Carter. If you decide to rebuild your old one, then check our Recommended Vendors for names of reliable fuel pump re-builders.