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Good news, your eliminating one thing at a time and seeing some progress........
Check with Edlebrock or Stewart/Warner or any other aftermarket water pump manufacter and see what they advise for pulley sizes and overdrive/underdrive %'s!!!!!!!!!!!!!!!!!!! I think you'll see the recommend minimum 15% to 25% overdriving the water pump to the crankshaft speed.....Could be your next step....
If you have an extra fan laying around, try mounting on the front and see if it helps, bet it will....
David
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DAVID GAGNARD
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