Yeah I think I've heard of a couple. All you need is time and skill to do all the fabricating for the mounts, plumbing, etc. Frankly if you're just going to drop in a run of the mill 350 I'd go with the 7mgte route instead. It's basically a bolt in motor swap, and just as potent a motor. You can buy a kit from Don C to make it an even easier swap yet (or have him do it for you). If your looking for mega hp in the end it might be cheaper with the small block and go through the extra hassle of fitting it. After about 450-500 rwhp uprgrades on the 7m start to get really expensive.
The motor in Wade's pics is a Corvette L98 5.7Liter. Corvette used that motor from 1985-1991. DgoodHue's concerns are realistic, and as he can tell you (since he owns an 86 Vette) the L98s are seriously torquey motors. You can't stand on the gas at low speeds without the tires breaking loose. I have autocrossed an 89' auto several times, and I have to be more careful launching that 89' than I do with my 99'. I would agree with the above posts and go the 7MGTE route if you are looking for serious power.