Actually that muffler bracket is pretty sturdy. The one on my
50, 3600 has obviously been on the truck for a good long time
and is as solid as a rock. I could dang near hang from the
muffler.
I had it off during the engine rebuild and replace the asbestos
insulator that was on it with some Refrasil Silica-Based Insulation:
http://www.pbase.com/dennygraham/image/154171292 The bracket and strap are available as reproduction parts,
Chevs of the 40's for instance.
Denny G