Will a transmission from a 91 camaro 3.1 bolt up to a 350 Chevy?

No, a transmission from a 1991 Camaro with a 3.1L engine will not directly bolt up to a Chevy 350 engine. The 3.1L typically uses a different transmission type, like the 4T60 or 4T65, which is not compatible with the 350's transmission mounts and input shaft. You would need an appropriate transmission designed for the 350 engine, such as a TH350 or TH400, for a proper fit.