It's easier to buy a GT with a trashed motor and convert that over.
You'd not only have to buy the KLZE, you'd also have to get the tranny, mounts, mounting points, radiator, fans & shroud, PCM, instrument cluster, wiring harnass, etc from a GT.
And if the KLZE doesn't come with the A/C compressor, alternator, & pwr steering pump, you'd have to get ahold of those as well.
There's probably a few other misc. parts that would need to be changed as well.