I'm assuming that you have a non-turbo 97, and in that case there are 2 main options.
1. sell your car and buy a GST/GSX
2. turbo your car with a kit from HRC
the first option is most cost effective unless you have a lot of money into your car right now. i understand it's not easy at all to buy a new car and sell yours, but there are numerous advantages in the 4G63 vs turbo 420A discussion.
and if you already have a gst/gsx (you didn't specify) then you already have the best engine, even if a swap to EVO was possible. i think you can do it if you have the cash, in my eyes not very useful.