On Dec 11, 8:15 pm, jukebox...@charter.net wrote:

That's not the engine code.  I would guess that it's the VIN number of
the car the engine was meant for--what are the last six digits of the
T/A's VIN?

The engine code will be something like XA or Y7.  See
http://www.pontiacpower.org/engine.htm to decode what you find.

Another clue is the number cast into the centre two exhaust ports on
the heads.  I'd expect to see a 6X....what do you have?

Finally, if none of the above makes sense, does the oil filler stick
out in a long tube at the front of the engine? Then its an Olds 403
and you'd have to chase Olds engine codes. A Chevy engine is also
possible, but that would definitely be a swap.

....Ed