you should give a complete rundown of the car specs. weight, converter, intake manifold, pistons etc. i'm not a big fan of high RPM but even with the mild 451 in my car i trap around 7300, i would think 6900-7000 is a little low for that engine. not that it's the problem but still sounds low. also imho that engine needs more carburetor. that's a pretty stout CR and while i know CR makes HP i think that much is unnecessarily high. the engine in my sig car is around 11.5:1 with edelbrock RPMs and a .585/.585-275°/275° flat tappet. yes it's a lot lighter than your car but it has run 162mph and almost always runs over 160