That could make a difference. Any reason for doing that, like did you brake yours? If going another spline or as far as you can go with the splines won't do it. I would swap it back to the other one.
No mine is fine I just couldn't get it to start so winding the screw in was easier than adjusting the splines.
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There's a part (the camplate?) in the pump that can be installed 180° out. It'd give the same effect of installing the pump with the pulley 180° out. hard start, low power, etc..
Instead of pulling the pump apart, rotate the pulley 180° when at TDC. It's worth a shot.
-Todd
Libby suggested removing the lines, key on and rotate the engine watching when fuel spills out #1 port. Works great, and is more than accurate enough to tell which side of 180 you are at.