magnum cam extension from hughes?

Here you go '63

GP4070 - It's the 7psi one. They come with bushings for the bracket and it's pretty quiet. Definately quieter than a Holley. Another thought is a small peice of rubber... like tire tread or something. I've used horse stall matting material too betweeen the pumps and the car body. So long as the bolts and pump is isolated, most of the noise is gone.