Summit sells a Flow Kooler aluminum pump. I've put three of these on three motors and never run above the T-stat temp except for that one time on the way up to Mammoth Mountain. (288 miles in 3 Hrs. 12 mins. You do the math. 3.55 gears with 255-50x15's.) Then it sat about 5-8 degrees above the T-stat temp.
