99% of their cams are to fit blacktop. I've bought heaps of their cams new and s/h , I still have a few sets, also adj cam wheels. Also have 2 or 3 CNC Ford Performance heads and other crazy Zetec go fast stuff.
As with good results with cams alone, maybe 20-25bhp up, you'll need to raise compression and tidy ports up and go better induction.
I put Esslinger blacktop cams in my silvertop and they worked fine, it was running on R1 bike carbs with 118kw/wheels @ 7100 rpm , approx 180-190 @flywheel.
Zetec don't like high lift on std springs so it's a good idea to upgrade them before valve to piston action occurs..