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I would not invest much into a high performance build using a GM tall deck.If you want serious power,consider buying a good block like Dart big "M". This block can be built out to 598 inches using low deck parts. There are quite a few used 540s around. All of these engines 540-598 have more potential in horse power per cubic inch than the smaller bore 454/496. If its just a mild build the 427 tall deck will work fine.
 

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If you home port the heads.use a mild cam and compression ratio.find an intake to fit.use an 850 cfm carb.headers.keep RPM to 5500 or so,then it will work.look around for an intake and see what you can find?
 
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