They could be run as is. I had it running with them before but didn't take it to the track.
I talked to Dwayne Porter yesterday. Think I'm gonna follow his advice and buy a set of Trick Flow heads.
From what I've seen, going to the oversized valves on 915's decreases flow (with out a lot of other work). It shouldn't be that big of a set back to save for the heads.
The motor is out of the car right now anyway. Seems like an opportune time to spruce it up.