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Offer them up to a set of 172 cams - You'll visibly see the differences in the lobes. The 197 cams have longer duration and they're also more advanced from what I remember.
197 cams should have a timing wheel (4 teeth) on the inlet cam.
I've got a pair I bought that someone has removed the timing wheel so it's useless for what i wanted (actually going in a 197)
I'll do you a part ex on some Pipers if you want, could do with a second set to get reprofiled as exchange units for the 197, and you'd see more noticable gains