HI do you have the right water pump??? some water pumps run rev and counter clock.the pump might be wrong and pushing into the goose neck and closing the thermostat at high rpm and the colder water in the rad is shutting the thermostat closed.
A water pump off a 89 looks the same but the belt...
HI holley vs holly over the years have got me some good deals on parts on ebay. When people put (holly) vs holley all you got is what they typed in,650DP and 750DP along with a 930 carbshop carb for under $150 lol .lol You go on ebay and put in holley that's what you got not holly :D ,My friend...
This is my 2c on some of your problems
Your duration a .050 is low that's is one problem you have with slowing down after 6500rpm.That cam is only good for about 6000 then it starts to die off,Your going to need a cam with more duration and a closer lobe Separation.for duration in the upper...
What is your top rpm of this engine? and your duration @ .050? And if your engine is making good torque you can put the 700r4 first gear in the th350 but you best have the grunt to over come the spread in 1 and 2 gears.
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