I'd have thought there would be better dogs to use out of the tin tbh
I'd imagine it's been a fair few generations since any have been used
For anything but showing or pets that guard a bit,what do you want to add by using them?size? Weight? Nice ridge down there back?nothing that you need in a running dog imho
Incidentally I've seen a ridge back cross work,average bordering on slow
Bull cross hands down if you need more strength,tenacity or balls