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In the very front of the engine on the camshaft pulley there should be a white line. You may have to clean it to find it. Directly above that line, there is a ruler with the timing marks. Assuming all of your plugs are wired correctly to the distributor and corresponding cylinders in firing order, you turn your engine to 12 degrees before top dead center or TDC (make sure with a whistle plug or a pencil in the #1 cylinder spark plug hole so as not to be 180 degrees off). Move the cam pulley a few times with the appropriate socket and breaker bar so that you know when you are approaching TDC. Right before you hear the whistle or you see the pencil at it's highest is before TDC It will take a couple tries. Don't go backwards, only forwards. Make sure you're in neutral with the wheels chocked. When this is set, you can try to start your engine. If you have a timing light, you can loosen the distributor from the intake manifold and turn your distributor to get it exactly right before snugging it back down. Lots of little tricks go into this depending on whether you have HEI or points ignition. If you have points and are setting a new distributor up, you'll need to make sure your dwell is set correctly. A .010" feeler gauge to set the distance between the point and the flat spot of the distributor's rotating shaft will do.
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