Which K member?

No matter which k-member you use there will be some cutting and possibly some drilling. Some choices will also require welding. In the days before there were k-members available from the dealer (about 1976) people either got the hard to find (today) factory big block parts OR made their own mounts. There are more options today, but I prefer to build copies of the old Direct Connection k-member (uses a 73-76 small block k-member).