thanks guys for the replies .
Pump is on way , Flowkooler . I use March pulleys so 1:1 near enough . I have a AFCO crossflow radiator
I have not run a tstat in nearly 15 years , i do not like the idea of being in the staging lanes with cold motor and quick call up with going to burn out etc with tstat shut . I use the Mopar Performance 5 blade viscous fan , though i have the Jag short viscous drive on it now after fan ate radiator in Jan after 10 years or so use grrr . I have factory shroud . Mopar viscous drive puts fan max 1/2"off core now is closer to 1
It did seem visually @ 1100rpm the GMB pump with cav plate moves more coolant than the Source unit .
Will see . Testing saturday so see how it goes on freeway to the track .

Tex