If your thinking of using a stock 340 cam, I highly recommend talking to Bob Karakachian at Mrsixpack racing. I think he may have a repop of the 68-4spd cam available.

I used an MP .450/.455 cam and it was OK. At the time I didn't know Bob, and the Comp. Cam. Xtreme 268 cam wasn't out either.

After talking with MANY A12 guys, and planning to sticking with bob's cams in the future.