Copo,
From your pics I'd guess it is a 250, but the way to tell is, can you post the numbers on the flat pad by the distributor?
Ok, either I have an engine that didn't get stamped with numbers, someone ground them off, or the paint is VERY thick and hiding them. For the life of me I can't find numbers anywhere near the distributor. I even had my wife helping me look so I wouldn't think I was crazy.
The only numbers that I can see are the ones just behind the motor mount (with the big GM under them), and the set of numbers above the starter mount and the set rear of those.
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