Need help from Old school A hotrod guys, Jim Brierley, Ken Parker...and more

[Nosetime]

Installed my Bubbas( Jim Linder) rebuilt 1930s YA 11 from a Gleaner Combine. Running a Winfield Aluminum head I bought from from a FordBarn gentleman. Head came with a large diameter bolt that would apparently secure the distributor to secure timing. What I have realized is two things. First, if I torque the single large bolt to hold the timing mark, I get noise as if I am pulling distributor drive off line and getting gear lash. Back off, and it will not hold timing mark. This was not a problem with my more modern 70's Mallory distributor. I also noted, there is an indented hole adjacent to distributor that would appear to accept a flat clamp with dowel pin and secure distributor like a more modern design. Any advice on procuring a clamp or should I fab one up? All help/sugguestions welcome. I have a small fortune in this distributor. Regards, Greg. Did not get the pics I had hoped for, so will add a few more later.