Pappabear71, boy did you ever dredge up an old thread!! Post up a picture of your motor and we'll let you know what's what, besides we're picture hungry 'round here!

Did you count the valve cover fasteners? 6 bolts = Windsor, 8 bolts = Modified (Cleveland)

If it's still stock under the hood, I'd bet it's the 351 windsor.

As far as what's better, I'd say the Windsor wins that selection. Oh, Welcome to the site, glad your here!