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Id do a Supercharger I have both a vortec v3. And 6-71 they are good bang for ur buck there around 2k$ but its a easy 100hp and its very reliable or u could put a 144ci or 174ci roots blower but either way u need a better/biger carb id say holley 700 DP with mechanical secondarys but other mods would be lucky to gain u 30hp