Big Block Water Pump Housing....440Source vs Mancini

I used the 440 source pump and housing on my duster and it has worked great. Temp is rock solid.
Flowkooler pump is just a gmp of whatever, parts store overseas pump with a plate tacked on. I've used both and I was pretty mad when I realized that, although when my flowcooler leaked, they did warranty it. I think they have a lifetime warranty.