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Because of the large ports you will get quite lazy throttle response at lower rpms. Also as the mixture velocity through the port will also be slow you may not get such good atomisation and fuel distribution. Im assuming that you are carburated and not fuel injected. The heads will be killer over 5000rpm though! As you have the heads I would give them a try, in a light car with 3.73 gears they may not be as bad as you might think. What do you expect to use as a redline? With the combination of heads cam and intake that you list the motor should rev to 7000+ easy.
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Mike
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