Transamgtaguy

I have a 63 bel air 4 door with 47k original miles. It currently has the 3.8 liter 230 CI inline 6. Motor runs great and all but I've been tossing around the idea of throwing a 4.2 Vortec in from a trailblazer/envoy. I know i could do a small block chevy and it would be way easier. I just think that this would be unique and it would be cool to sick with the I6 theme since thats the way it was from the factory. My car has a 2 speed powerglide trans. Im just curious how much fabrication this would take. Would it drop right in, what motor mounts would i use. and what transmission. Any help would be appreciated since i feel like i am going into uncharted territory that hasn't been explored yet. But anyways, Any input would be greatly appreciated.