what to do about this problem
who might now what this problem is. When I'm driving on the hihgway. and start to reach about the 3000 rpm mark which is about 65 to 70 miles an hour, the motor starts to emit an oily smoke out of the exhaust. As the rpms get a little higher the motor starts to make a slit amount of what sounds like pinging but doesn't sound like it is detonating. motor is set at 15 degrees of base timing. I had this problem before with a holley double pumper. I disconnected the mecheanical secondaries and then the problem disappeared. Until I got a case of bad gas, I put a speed demon(same size as holley 750 dp)and tried disconnecting the linkage but it didn't cahnge anything. Not sure what to do. Other than this the motor does good and idols fine even with secondaries disconnected. I know I should probably buy a vacum secondary carb, but i want to use what I have first.
Thanks for the help.