I did pull up the asphalt floor boards. Then cleaned and touched up the rust spots. I used B-Quiet. It was probably 1/2 of Dynamat and listed its sound deadening properties near Dynamats. I haven't seen the other makers list their sound deadening properties. I also did the fire wall. The ruber or plastic shell, I put 1/4 heat shield stuff. I should have used 1/8. I patched up the asphalt stuff and put some EVAP foam sheets to hold them together and to act as the faom layer it had. I cut the asphalt boards in sections. Once I got one section up with a scraper, the other sections were easier to pry up.
Tom