The exterior timing lines on the pump housing and adapter are there only to get you close. The actual timing should be set using the internal timing marks and the marks on the front crank pulley.
Turn the engine crankshaft clockwise when looking at it from the front. Stop when the pointer on the front cover is in line with the correct degree of timing advance. With the fuel shut off at the tank, remove the timing cover on the side of the pump. The scribe marks should be aligned. If you only see one scribe line, rotate the crankshaft one complete revolution. If the marks are not aligned, rotate the pump housing until they are. If you had to move the pump, rotate the crankshaft two revolutions and recheck the timing. Readjust and rotate until the are aligned after turning the crankshaft.
Once you have the timing set you can use a chisel to remark the pump housing and adapter so you will not have to do the internal check again if you have to R&R the pump again.
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