It can be done, but it'll cost a bit.
You'd need a drop bar (I'm assuming you have one) brake levers and shifters.
For the brake levers, because the 7.3 has linear pull, you'd need dia-comp 287-V levers, or Tektro RL520 levers. The tektro ones are cheaper, and pretty nice.
for shifters, since the 7.3 is 8 speeds, you'd have to use bar-end shifters, a set of those for 8 speed is about $75.
Alternativly, You could change the linear pull brakes to normal Cantilevers, and use integrated shift/brake levers. you could get the brakes for about $20, but the lever/shifters are around $125 and up