The Manley #43140 rockers are perfect for your engine if you don't have the "O" rockers. They are almost as strong and look identical except for an "M" on the rocker where the "O" would be. The slot is longer too. It's a good part. Only failure that I had was taking them over 8200 rpm, and for the most part they work well just about all of the time. I break about one a season which is a good average. A show car will never hurt them.