Just an FWIW for this thread. When I did my HEI conversion, I found my clamp at a Westlake Ace hardware store. It fit perfectly on the shaft of the ditributor. Also when i modified the distributor shaft, I used a lennth of all-thread (half inch I think)covered a section of it with black tape to protect the bushing insde the dist housing, then used some nuts to clamp it with. I then chucked it up in my drill press and used a grinder to work down the original hold down. Once close to size,I used a file and varying grits of sand paper to finish out the distributor shaft. This was before I got my lathe. Seems to work pretty good so far. I may have some pics if anyone is interested.
