Amen to that.
I live without it on my 83 TD MB Wagon and I think I might just have to do the same with my 56, It isn't all that bad. If the Hush Mat all around the cabin doesn't do enough I guess I'm just going to have to live with it. Unless they make something that looks really really good under the hood of the old truck.
But yes do make a big difference. I've noticed the biggest difference is usually extra padding especially around the floor board and firewalls where the turbo comes down. Made a Gargantuan difference on my F-250.