I just finished swapping out the distributor, intake and carb on my 1955 292 to a 57 intake, Holley carb and 57 distributor.   The engine sounds much stronger.  My timing mark is the older type with a pointer and one small notch on the pulley.  Is this mark TDC?  I don't see any other degree marks anywhere.    I used my timing light to set the timing to be what I believe is about 5-6 degrees advanced.   The engine seems to idle too fast and the idle screw won't lower it.    Where should the initial timing be on this engine?