There were only two engines available for your 3200...the 235 6-cylinder and the optional 265 V8. The 261, 283 and 322 were all big truck engines in 1957. Since your Serial Number doesn't have a "V" prefix, it was not born with a V8 engine, so it had the 235. The front cross member V8 motor mount brackets were riveted on at the factory and the aftermarket brackets are bolted on, another way to tell if it was born a V8...
The 3 on the tree 3-speed was the standard issue trans with the HD 3-speed (with floor shifter) and the Hydromatic as options. Look at the floor board just above the steering column and see if there is a hole in the floor that the column linkage went through...if there's a hole it was born with a 3 on the tree or the Hydromatic. Now look to see if it had a clutch pedal hole...if both of these are yes, than it had the standard 3-speed.
Mike B
