You would be surprised on the people running the Moroso water pump drive kit.
I know I was floored when I seen Bob Reed's Cuda have one.
Like someone else said they are simple and do the job.
I have run the Meziere drop in unit for a big block. I ran that water pump season after season..It was one if the few things that you can install on a race car and absolutely forget maintenance or trouble.
But Now I dont have a aluminum water pump housing or water pump...So getting both of these and then add in the cost of the Moroso drive..Im looking at the complete Meziere unit cost wise.