Post note: How fast should the curve be? In other words, at what rpm should your timing be "all in"? You have a 4 speed. A clutch loads the engine totally different than a converter. Then your driving style.
Do you tend to "lug" the engine to keep from shifting so much? Mine liked to be "all in" at 2,500rpm, but yours may need to be higher. Listen carefully, check plugs for shiny spots, DO NOT DETONATE THE ENGINE! Then the most argued point, do you or don't you run vacuum advance? I do, my engine has 45+ degrees WITH vacuum advance with no load, trust me, it LOVES IT at part throttle "tip in". By the way, I am not a "guru" just a basement built "hot rod".