I've got a Kent CVH35 in my RST and have clocked up nearly 12000 miles and so far it has been good as gold. I know of more than 1 person that has had problems with Pipers 285T2 camshaft. Had a Piper cam in the XR2i though and it improved the car a fair bit.

Speak to a few reputable tuners and see what they recomend for the spec of your engine.