I've seen close to 10° temp drops using one of the pumps like a Flow Kooler w/ the plate on the impeller compared to a stock style pump. I've also used the Milodon version w/ success.
Keep in mind that these style of pumps require the use of a balance flow style thermostat like a Robert Shaw. They claim the added pressure from the pump will close a standard style thermostat.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax
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