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It all comes down to how much you want to spend? the 403 is a good choice as well as a well built 350, I have always wanted to take the 350 Olds diesel block that has the same main journal size of the big blocks and build a stroker. The diesel block is alot stronger than the 403. and finding a high horsepower older 350 is getting harder to find. It all comes down to how much you want to spend?
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