Of course, the liberals were in control of the SBC until the conservatives counterattacked in 1979, so I'm quite sure you can dig up plenty of liberal material from your first decade.
Some SBC resolutions from the 1980s:
1980 - Be it therefore RESOLVED, That the Southern Baptist Convention reaffirm the view of the Scriptures of the sacredness and dignity of all human life, born and unborn, and
Be it further RESOLVED, That opposition be expressed toward all policies that allow "abortion on demand," and
Be it further RESOLVED, That we abhor the use of tax money or public, tax-supported medical facilities for selfish, non-therapeutic abortion, and
Be it finally RESOLVED, That we favor appropriate legislation and/or a constitutional amendment prohibiting abortion except to save the life of the mother.
http://www.sbc.net/resolutions/amResolution.asp?ID=19
From 1982
Be it finally RESOLVED, That we support and will work for appropriate legislation and/or constitutional amendment which will prohibit abortions except to save the physical life of the mother, and that we also support and will work for legislation which will prohibit the practice of infanticide
http://www.sbc.net/resolutions/amResolution.asp?ID=20
Do you want the ones from 1984, 1987, and 1989?
You'll be hard pressed to come up with anything liberal on abortion after the conservatives consolidated control in the mid 1980s.
lETS bE rEAL.... tHEY DID SUPPORT ABORTION WHERE IS THAT IN THE BIBLE?