Re: which intake?
*****in85, the single plane manifold will probably make it run worse than the leaking stock one. If it's just a gasket leaking on your stock manifold I'd just replace the gaskets & call it good if you don't have money for a dual plane manifold.
3r!c84, the 305 is basically a 350 with smaller pistons & crappy flowing heads. The Performer RPM is a great high rise dual plane manifold, but I think I'd go with the regular Performer on the 305.
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