The 3836233 indicates it's a late 55 235 block, as does the 55 at the end of the serial number, with the F indicating it was built at the Flint plant.

Here's the link for block casting numbers. Link

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.