Ok I am trying to make sure my blazer is times correctly but I can't get to the dumb timing tab to clean it off so I can tell where I am at. . My fingers are to big and wont bend right. The tab is semi clan as is and I can't see any indication of numbers on it. Anyone got an idea of what tooth I should be at or am I asking something that is model specific. It is behind the water pump on a 1983 305. Is it esential that I get the motor to the rpm that the emission tag or is it ok just as long as I pull the vaccume advance?