The bottom line is that your complete engine/drivetrain combination boils down to "Wheel Torque" And wheel torque can be determined mathematically thru the following:
-Engine Power Band
-Coupling Device (converter or clutch) Multiplication Factor where applicable.
-Transmission Gear Ratios
-Rear End Gear Ratio
-and Tire Diameter.
For example, double overdrive is of little use if it takes your engine out of its power band. Gearing your engine to take advantage of double overdrive might render 1st gear useless. A drag car is usually more concerned with taking advantage of 1st gear, while a touring car is more concerned with making the most of overdrive.
We cannot and should not take this conversation further without first getting answers to the basic questions:
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Manual or Auto? What will you use for rear tires? Will you also run slicks in addition to street tires? What is target vehicle weight? What are your intended uses for the car? Assign percentages for the car's life at the track vs street? What are cam specs? Carb or EFI? What is the altitude where you live (very important on carbureted monster big blocks.)
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