I haven't done that tight of a connection at MCO, but have flown in and out of there many times. I'd say that you're cutting it close with that connection. Getting off the plane and reclaiming the bags will take 20+ min. Checking in with BA would probably take 10 min. if the line's short. Security can take up to 30 min. at busy times. After security, it would take a fast walker about 10 min. to get to the most distant gate.

If everything goes right, it'll take close to an hour to make the connection. I wouldn't risk it, especially on separate tickets.