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HELP Is this pump orig?1994 gmc 1500 vinS

packers905

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DS4 831 5521 10790220 12561307 I am having real mental problems due to this truck!! Tonight I rotated pump until It would start with advance motor plugged in, but guess what it took a 1/4" travel!! I hooked up snapon scan and now its showing act advance at 24 , desired still at 6. I am trying to get hold of a tech 1 but I cannot understand how I will be able to retime with advance hooked up because it wont run unless the pump is waaaay off the mark. I was sure the pump gear had been installed wrong so I pulled water pump dot to dot with crank pulley lined up with timing pointer so thats not it.
 
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