In 1977, General Dynamics proposed an advanced version of the FB-111A, the FB-111H, to compete with the Rockwell B-1 bomber. The FB-111H was quite similar to the proposed FB-111B, with advanced avionics, General Electric F101 turbofans, and six underwing stores pylons. However, it had an enlarged internal weapons bay capable of carrying up to 12 SRAMs.
A modified version would have had a ten-foot longer fuselage and would have carried twelve cruise missiles on underwing pylons plus four SRAMs carried internally.
Since the Rockwell design was the winner of the contest, the FB-111H never progressed beyond the study phase.