318

If you have .060 taken off the heads you'd better check your pushrod length because you'll need either custom length pushrods or rocker shaft shims. With the Torker single plane manifold, I wouldn't go too radical on the cam or you'll completely kill your bottom end torque. You should be O.K. with your stock type rocker, and your valve spring decision will depend on your choice of cams. Summit has a couple of cams that might do the trick for you, but stick with the smaller one with the 318. Also, your header choices for the 66 Valiant are very limited and big $$$, that's why I'm still running manifolds on mine. :)