Its alot easier says alot of people, because the 350 is a very generic motor, and has a high following of parts and accessories. You can get them probably cheaper, youll have a variety of tranny's to use.
Glide's etc etc.
They need less retro fitting than a ford. The one other thing you would need would be a bigger radiator and electric fans for cooling purposes. And honestly you wont see much sag, but it would probably be best to get some HD coils.