600Xc's have these configurations
600 big block twin
600 small block with VES
The triple probably would be the easiest with additional parts.
Big block you would have to get steering and engine mounting from a BB Xc.
the Small Block water pump off the front center of the engine is more than likely going to hit your steering rack.
Anything can be done but it will not be an easy swap
Just buy a used Edge sled and have the best of all worlds. That 94 chassis is a hardtail