Can someone recommend some sound deadening material?

I used Dynamat and did the whole interior of my 70 coronet and will be doing my 72 Scamp as well. I think the stuff is awesome. Buy the extreme bulk pack from amazon.com. It should do the whole interior. I am also running flowmaster 40series. You will still get some of the drone, but it helps a lot to reduce noise. I have no experience with the cheaper knock off brands.