SBC 350 bone stock at idle the motor runs perfect... dwell set at 30deg, timing at 10 degs BTDC check manifold vaccume and the motor holds soild at 20Hg. Carb, cap, rotor,coil, plugs, plug wires, points and condenser are all brand new. At higher rpm for an extended period of time it feels as if it's missing......something in the timing perhaps. I had to reshim the distributor gear as there was quiet a bit of play. could the plug wires being to close to each other or touching something thats hot!!