The sure grip units are interchangeable from all the cases. 741/742/489. Carrier bearings are different from open to sure grip unit. Your underlying question, I would go aggressive. Doesn’t sound like a moderate combo.

best of 11.24 at 119 mph 1.60 60’. 68 340 S Barracuda Fastback F.A.S.T [IMG]http://i67.tinypic.com/2mnnnnt.jpg[/IMG]