Fuel pump and injectors because you always want to make sure you are getting enough fuel. Better to be to rich than to lean. If you have the money go with a ATI procharger that comes with a inner cooler. I know a guy pushing 23lbs. of boost off of it. That is one of the best you can buy. You might want to think about piston rings too depending how many miles you have on it. I'm not sure on upper and lower intake but I have a performer RPM upper and lower edelbrock intake on mine.
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