I love this kit. I mean, I LOVE IT. Why? First of all, it is fairly simple and fairly cheap. Secondly, it (almost) capture the beauty of the classic Ferrari 250 GTO. Sure, it isn't a perfect match, but it's gorgeous nonetheless.
The kit comes from a company called thunder ranch. It's built for a datsun 240, 260, 0r 280 Z car, and only requires minor alterations to the base car.
Also, there are plenty of V8 conversions on the market for Datsun Z's, so don't think this only packs the looks.
There is also a 250 GTO convertible on the market, but it really looks like a cheap imitation.