I'm thinking Comet too. Look how the Merc speedo is larger and goes across the whole top. Yours looks smaller to me. Looks like a smaller car and not like a Falcon.
Love the old gauge clusters from that era. I have a 60 El Camino dash in the attic for a future custom build. Getting it narrow enough for my next build (another 38 Ford PU) will be a challenge.[S