Help! I'm seeking some other opinions as to what's up with my car. here's the stats. 1970 4v closed chamber Cleveland. motor is fresh(less than 100 miles since complete overhaul). here's the scenario. when i first start the motor the rpm's shoot up to about 1700 then without touching anything after about 15 seconds the idle drops down to where it stalls. I turned the curb idle screw in a little and it's the same thing. i checked for vacuum leaks at the manifold to head area and the carb base plate, no leaks present. i closed off the pcv hose with some hose pliers and the car died immediately. i covered the air horn and it dies almost immediately. I just replaced the power valve and re-jetted the carb. it's a 600 holley. I pulled the #1 plug out and it is very sooty. like its way to rich but i ran the air/fuel mixture screws in and turned them out 1 1/2 turns. same thing happens. it's got a healthy cam but i have no power accessories that require vacuum except the headlight system. but for this scenario i have plugged off the nipple that the h/light hose connects to. I'm stumped. i,ve got the fuel pressure regulated to 6.5 psi and 10 deg initial timing. what the hell am i missing?