I was planning to use the same setup on the Magnum swap I am working on for my '91 Dakota since that pump is that same as the GC. Meant I didn't have to break the pump loose and make a mess.
Unfortunately, the '91 318 serpentine setup uses a narrower belt so I would have to swap the pulley and when I realized I would need to measure for a belt and it would (most likely) be non-standard, I dumped the idea and plan to use a '92+ Dakota pump and mount.
FYI, that pump is the same one the Gen1 and Gen2 Viper used. So, in theory, should be a good pump.