1995 Ford F-250 exhaust

This may seem a dumb question but here goes
I have a 95 F250 with a 4.9 inline 6 now the muffler and tail pipe are rotted but I have a brand new muffler and tail pipe on a 1973 GMC motor home with a 350 sb v8 motor is shot and is going to go for scrap. Can I put the muffler from the 350 on the 4.9 without causing performance problems or engine damage. The exhaust on the motorhome cost almost $600 and I dont want to lose it if I can use it on the ford. I put it on and with it on you cant hear the truck running it is like a car. In this time of the economy saving money is important.