Non veni pacem mittere, sed gladium.
The new muffler says she's a runner for sure.
There are times when you have to agree to replace old parts with new parts. I know of purists who refuse. A 12 Volt electrical system is a good place to start.
It brings back memories. In the 70'-80's we had a mid 40's surplus jeep on the farm I grew up on.
I could never figure how anyone over four feet tall could drive one. I sat in the driver's seat ONE time and it felt like I was sitting on my heels, and that was a new one in a showroom.