Canyon, I have a similar situation. I have '54 GMC with a Chevy 235 in it. Block casting # is 3837004 as well, the boss behind the distributor reads "F8I4H" and the I is definitely an "eye" not a 1. I have been as baffled as you. I know the truck was manufactured it California, and I purchased it here (in CA). It was the 9th one off the assembly line that year.
