Sounds way too small to me. That depends on you though. At 6'2 or 3, I'm finding my 22" mountain bike with drop bars to be a bit small. With a lot of seatpost and a 140 mm stem it sort of works, but I think you're going to find that if you do the transition you're going to spend a lot of money to make a bike that still doesn't fit well.
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Bikes: 1996 Eddy Merckx Titanium EX, 1989/90 Colnago Super(issimo?) Piu(?), 1990 Concorde Aquila(hit by car while riding), others in build queue "when I get the time"