Timing marks

If u cannot obtain the itming marks, u mite have to time the engine by first pricnciple. Ensure that #1 cylinder is @ TDC (compression stroke). Install the camshaft making sure that the cam lobes for #1 cylinder are on the lower side and not on the tip of the cam. Also when installing the distributor, ensure that it's set to spark @ #1 cylinder. In modern day vehicles, the distributor can only be fitted one way so theree is no need to time the ignition timing via distributor. If this is too much, u can check the crankshaft & camshaft sprocket for distinct timing markings . This should be checked when the components are clean