I'd get into a Chevy forum or google chevy swaps into ford mustangs etc etc. If you do this you will most likely find your answers on how to swap that 350 in. Definitely need the right K member/motor towers & mounts, driveshaft/rearend stuff, carb or EFI? So much goes into a build like that I'd make sure I had something else for a DD while the install is going on as it could take some serious effort to get everything in correctly. There are some 94-04 mustangs with 351 ford motors (5.8L), but I bet that swap is a little bit easier/more compatible. Good luck.