stock 318 more torque?

The stock cast 4 barrel manifolds are very good. Our '87 318 with small valve 302 heads, an Ed Performer manifold, headers and 600cfm carb has a Comp Cams XE256H cam P/N 20-221-3. It idles very smoth has lots of torque down low and suprised the heck out of me on the top end. It is the largest they recommend for stock converter. When compared on thier computer program it's the largest for more torque than H.P. as you go bigger the H.P. goes up torque drops off dramatically.