I did a fair amount of cam testing with a big block that had exhaust manifolds. The best cam was the Mopar .528 solid which is a single pattern cam. What I found was that the engine was very sensitive to duration and overlap. If you had too little duration the engine made a lot of torque down low but wouldn't carry it very high. The longer duration cams lost power down low and they also didn't carry very high due to exhaust restriction. The .528 solid cam was just right. It is small enough that it makes great torque but it is big enough to carry the power up to about 6000 rpm. This cam test was published in Popular Hot Rodding about 10 years ago. Can probably find it with some google searching.
