I agree with the above posts. Sounds more like an intake gasket. You may ask the American Muscle Car museum about help with it. It's a private collection, but they have top notch staff that take care of those cars and they have a lot of Chevrolet/Yenko muscle cars. I'm sure if they couldn't help they would recommend a great shop to repair it for you.
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Andy
1967 Camaro 406 4 speed
1969 C/10 383 5 speed
1969 D300 318 4 speed
1969 Super Bee 383 4 speed
1972 K/5 350 Turbo 350
1972 Duster 340 727
1974 'Cuda 340 4 speed
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