The "Type" number will give a pretty good approximation and
also will tell you exactly which engine you have,
They start with 49 and are six digits long (although there may be more digits
there only the first 6 give the type). The first two or four will be cast on
the block and the rest are stamped and sometimes hard to read. They are at the
top of the block above the distributor. If you'll post the type number I can interpret it for you.
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George Downs, Bartlesville, Heart of the USA!