There might be a couple of other options. Check to see if the FE distributor shaft will fit into the FT housing. Also you could conceivable cut the FT shaft a little below the body of the distributor, and graft on the bottom of an FE distributor shaft with a coupler of some sort. I also don't see any reason why an FE block couldn't have the hole for the bottom of the distributor shaft bored oversize a little, although I'm not sure how you would do that. Stepped drills and a reamer, maybe?