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My '66 was leaking badly from the front and rear of the intake manifold. A month or so ago I replaced the factory cast iron behemoth with an Edelbrock Performer RPM, I used Edelbrock intake gaskets on the heads and no gaskets front and rear per the Edelbrock directions. I used "Right Stuff" silicone goo instead and it worked great, no more leaks. From what I understand it's hard to keep the front and rear gaskets in place when setting the manifold back down on the engine, no surprise since it weighs like 80lbs. I was able to put the Edelbrock on by myself, it only weighs 23lbs.
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