I didn't mean to knock your setup, For some reason I thought you bought the car the way it is built. The stock pulley sizes for a 67 V-8 with A/C and power steering, water pump pulley #18 in the chart 7 and 1/8 and crank pulley #22 in the chart 8". You would have to do the math to see if your combo matches the water pump revolutions of a stock setup at idle speed. If you spin it to slow at idle it will cause obvious problems but if you spin it to fast the coolant does not stay in the radiator long enough to do it's job in stripping the heat away, also a problem. that fan clutch sounds suspect to me and I would bolt on another non clutch type fan to test it. I know what you meant by the spark/timing curve and was assuming it was optimized on an engine dyno but recommending it and the fuel be optimized on a chassis dyno. Thanks for the info on the paint. Do you find it burns off in the usual spots like the cyl. head exhaust ports?