When I restored my 77 I was trying to stay as true to factory as possible. My car originally came with the extra sound deadening, and I used the heavy duty stuff form Ames as a replacement. It was about like 10 layers of 30# roofing material. I will say on the 79 I am restoring I am adding as much sound protection everywhere as possible. The 77 with the original type stuff is too loud for me. I want to quiet the ride as much as possible. Although being your car is running and on the road you know what it sounds like so adding only the original type is not going to hurt anything.
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