I don't think you want to delete those keepers..!
If you want, you can install umbrella-type seals.(Ford-type), on the Intakes..but they should not be necessary..unless the valve guides are a little loose. Probably good insurance against sucking oil past the Intakes...especially if they were knurled, to re-size them.. Seems to me that I used 318 valve retainers on mine, to increase seat pressure..