Pulley dimensions

After some research I have found that Ford no longer makes the pulley set for the water pump I am using.
The pump is a Ford motorsport # M-8501-E351S which measures 4.5" from the mounting surface on the timing cover to the face of the pump where the pulleys bolt up.
This is setup for standard belts with the standard rotation. I plan on using a single groove pulley on the water pump.
My question is does anyone have the measurement from the timing cover mount face to the center of the first groove in the pulley?, from there I can figure out the crank pulley and set my alternator spacing.
I am planning on making the pulley set out of aluminum, and I want to do a reasonably larger pulley on the alternator to slow it down a bit.
Thanks in advance
Cheers
Phil
 
A small edit to my post, the literature to the pump says 4.25" from the mount face to the pulley mount, this pump has a backing plate and I get more than their measurement, but I still need a dimension from the timing cover to the center of the pulley.
Cheers
Phil
 
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