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You'll gain bet. 25 to 50 hp with that, but to utilize the changes better will require a new camshaft. Edelbrock has a complete package available. You will also need you distributor reworked for faster advance. With the headers go with a larger, freeflowing exhaust system and a crossover pipe between them to balance out the exhaust scavanging of the motor. Supercharge or turbogharging is another option as is NOs (requires some major work in the bottom end of the motor to handle the additional 150hp and electronic seloniods and additional fuel lines to supplement the NOs.).
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