Appreciate for all the info. I am also doing a slabside right now and uncertain as to what to do about the clock. Not sure exactly how much I want to torture myself with this right now as to finding a Galaxie clock & doing the fabrication, but I at least need to come up with size of the hole to have ERA put in the dash. In looking for a clock for my Sunbeam Tiger I recently came across a Smiths reproduction. One was on ebay, the auction is over but here is the link for what its worth:
Smiths Clock Reproduction for Sunbeam Tiger and Alpine | eBay