As a former builder/owner of the GT II, I can tell you there have probably been some modifications to the rear section which could affect the integrity of the body from the rear fender wells backward unless a new supporting framework was fabricated to support the rear. I'm pretty sure the engine compartment sidewalls would need to be cut into to fit that engine. Also, the bulkhead in front of the engine probably would need to be reworked.
The side glasses and framework for the small drop down glass are missing and are no longer available as are the glass quarter windows. Viracon manufactured the glasses, and I believe they stopped long ago, at least back in the late 90's they told me they no longer had the main door glass. The doors aren't reinforced and tend to twist and break at the outer corners of the sunroofs.
I will say they are fun cars and they really hold the road very well at speed.
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