basically you have to set it up as if you were going to drop a 5.0 into it, which means you need a new k-member, a 351 will fit under the hood but with some work, but with a carb it may even be easier. a T5 sure you can do that, but why not upgrade while you're at it, t5's arent really that strong
http://www.freewebs.com/vristang/fox351wswapfaq.htmall the info is pretty much the same for dropping it into a 97
http://saleen351.home.comcast.net/351/351.htm
and im going to flame you anyways for wanting to go carb, fuel injection will keep your car legal