Sound deadener / how much for a tri 5 ?

[Aschle]

I just took my 57' Chevy for a good long drive and am now looking into sound deadener. I have only the carpet and jute pad, nothing else (no door panels or headliner), so I realize that is a huge culprit but I think I should put some sort of mat down on all of the panels. I stopped by the local street rod shop and they have dynamat and hushmat... The hushmat was about 15 % cheaper, so I may go with that. 58 sq ft for 300.00 sound good? I would like to entirely cover the roof, doors, floor, trunk, rear side panels, firewall, etc... Can anyone give me a square footage on what is needed? I can go out and use a tape measure, but would rather not if someone already has this info... As a guesstimate, I am thinking 2 boxes of the 58 sq ft mat should get me there. Thank you!

Jason