Belt spacing was referring to the offset of the H/B, the LS engine uses 3, short medium, & long. The Novak conversion gear mostly refers to the 5.3 engine which from what I can gather is the truck engine. Which runs the long offset H/B. They list the 3 kits for the A/C conversion, which one do you have???
If you decide to run truck spacing your original water pump is OK as you can get a spacer kit to take it out to truck spacing. Which will have a provision for the steam vent pipe which will need addressing.
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