According to Hollander, that head was used from 54-55, but apparently it was used well into 1956 (to use up stock) before they came out with the "848" head.
Actually, its a 3 bolt mount. The third one is directly below those 2. Remember, this is a '53 car motor which used side mounts. In order to use it in your truck, they drilled 2 holes in the front motor plate to use the truck mount.
Wow. That's one oily motor...
I had heard that they used the captains bars on '54 car powerglide 235's, but I wasn't aware of it being done in '53. Apparently it's a very late '53, or perhaps they were still using LAQ into early '54?? A date code and casting number from the block would be interesting...
