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Oh.....I wouldnt waste my time trying to increase the HP with the 307....Most everyone goes with the 350 or 403 as they are both smallblocks and have the same external dimentions so nothing changes under the hood except HP......I doubt you will find anything in the junkyards to soup up the 307....the speed shop and machine shop would be more likely but the 403 and 350 builder core engines are still in some yards.
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