Glad it's working. We probably need to create Joy's tarball in the future with the same file ordering he used and get that the Warren. The trick is getting a v6tar that properly works. Maybe one thing we should do is write a tp format 'tape' with the v6tar binary on it and get that in the archives independently.
When V7 came out, there was a way to create v6tar (which I suspect is somehow part of Joy's image). The issue is that some of the system calls changed in small but important ways. tar was a much better way to move files around than tp which is why it so quickly became the archive scheme in the Unix community.