A few months back I built a 454 with the help of my dad to put in my 55 sedan. It is a 4 bolt block that has .030 over Speed Pro hypereutectic pistons with .100 dome and a stock cast crank. It has an Edelbrock RPM intake and a Holley 4150-850 cfm carburator. The heads are stock GM 781 castings. The headers are Heddman 1 7/8 full length. The cam is a hydraulic flat tappet Comp Cams XE268 with .515/.520 lift. It has Comp Cams 1.72 roller tip rockers. After the initial break-in and adjustments I noticed this cam just don't seem to talk to ya, if you know what I mean. I just thought it would have a little more bump to it. I have not been able to drive it yet due to other things not completed yet. What kind of performance will I get from this cam with the aforementioned combination of parts? The car also has a stock 8.5 from a Trans Am with 3.08 gears and a Saginaw 4 speed.