Hi billygoatbob. with a 33 inseam you should be looking for perhaps a 60 - 62cm. depending on the year and wether it was manufactured in Italy or Japan the sizes were either something like 59, 61, 63 (if it came that big) for italian and 58, 60, 62 for Japanese bikes. the best thing to do is ride a few to get an idea. I know that is not easy but depending on the price range, a good knowledgeable seller should let you testride.
where do you live? there are BF resellers everywhere and they are certain to be able to assist you.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk