I had the same problem I used a holey base and trimmed it to fit then it workedView attachment 416734
I don't think so. I just purchased a 383 air cleaner for my 64 thinking it would fit over a Holley DP, nope! The one for the 383 is much smaller and they also came on some 6 cylinders. They look like the pic above and only fit on the carters. I'm going the same route as above and using a 426 street wedge style for more airflow.