Cal Jackson, original driver of the High Heaven Fuel Altered and nitro Funny Car of the same name, experienced a mild stroke at his home in Montrose , Colo. , March 26 and was airlifted to St. Mary's Hospital in Grand Junction where he underwent brain surgery to relieve pressure. He is recovering in a rehab center near his home but must be treated for brain cancer. Cards and well wishes can be sent to Cal Jackson, 66121 Juniper Ct., Montrose, CO 81401.