Frustrated engine wants to die at idle

Ok well, i swapped the springs put a heavy and light silver spring in. I put the black little circle thing in. That was a royal pain in the ***! But its done. I also put a set of mufflers on the car as it has been open ever since i rebuilt the motor. So i proceed to fire it up hoping i got the rotor on correct cause i spun the engine over for that black doohicky. It fired... major exhaust leak at the head. Not happy at all with schumacher headers! But thats a different story. Timed it at 18 revved it up maybe 3500... brings it to 40. Felt pretty good but still cold and im sure the carb needs tuning. So isnt 40 too high? This is 92 pump gas 4500 elevation.