I used the Peel & Seal on my '49 everywhere. It is not as thick as Dynamat, but is much easier to form into corners and curves.
it does an excellent job at keeping the heat out and reduces the road and engine noise to the point that all you hear is the whistling door windows.

1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission