WAUSAU f— One driver was injured seriously and another shaken up Sunday in crackups that marred the Rib Mountain sportscar hill climb won by John Kilborn of Decatur, Ill., in record time. Adrian Warren of St Paul, Minn., suffered head injuries and a broken arm when his Lotus screamed off the track while coming out of a curve near the finish line. The car stopped in a woods. Warren was reported “out of danger” at a hospital here. Jack Baker of Minneapolis es caped without serious injury when his El Toro rolled over several times after leaving another curve in the twisting, 1.9 mile paved course. In the best of his three runs, Kilborn, in a Ferrari, swirled up the course at nearly 88 miles an hour, for an official clocking of 1,209 minutes. The old record of about 80 miles an hour was set last year by Milwaukeean Jim Jeffords in a Mercedes Benz 300 SL. Finishing behind Kilborn in the over-all event was Loyal Katske of Omaha who was timed at 1.337 minutes in another Ferrari. Jeffords won the over-all event for production cars with a run of 1.361 minutes in a Corvette,