Tom,
What kind of engine is it? Those numbers do not seem to be for a 216/235/261, but I cannot be sure.
Where are those numbers on the block? Some photographs might help someone identify the engine.
If it is a 235/261 stovebolt, Tim Lederman from the Stovebolt.com site has provided some web pages that help in finding and decoding the numbers on the
early 235s and for the
later 235 and 261 engines.
