Cambridge native Matt Kenseth says he’s looking forward to getting back on the track and behind the wheel this week. Kenseth lives in North Carolina now and he has stepped aside from NASCAR competition at the age of 47. He had 39 Cup victories in an 18-year career. Friday night he will race in the Howie Lettow 100 at Madison International Speedway as part of the ARCA (ARK uh) Midwest Tour Series. He won the 40th Slinger Nationals last month.