I caught an 8 pounder on Old Hickory last July on a superbugger while carp fishing. It was actually the only bowfin I've ever seen on Old Hickory. He snapped up the fly as soon as it landed in front of him.
I think you'd have decent luck with any standard baitfish imitation - I'd pack plenty of large clousers, wooly buggers, and maybe some oversized kreelex minnows if you can tie some.
If you are in a place where you can sight fish them, I think you'll find that any streamer placed in front of them properly will draw a strike. They are pretty aggressive, similar to gar. If you're blind casting, be prepared to cover some water. I don't think their eyesight is that good, and they tend to ambush prey rather than chasing it for long distances.
If you haven't caught a bowfin before, word to the wise - don't put your fingers in their mouth. They have teeth and they will bite the shit out of you.
bd