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Is the engine a 318? This is one of the reasons I am always against installing 360 heads on a 318, the intake ports for the 318 are smaller and the intake manifold is smaller ports so the gaskets/ports don't match. It also drops your compression lower than a low compression 318. If you insist on using the 360 heads on the 318, you need to install a 360 intake to prevent intake leaks.