Folks, 1957 Series 1 (2ltr) running very rich (as in smoke from the tailpipe and odor). I put a new carb on it with no change. I cleaned the oil bath air filter and reassembled. I adjusted the timing to 6 before TDC. The air hose (cleaner to carb) has oily black coating inside. Changed all four plugs last night.

What else can I check/do? THANKS for any input...I am learning mechanicals as I work on this truck so this is all fairly new to me.