FYI - the important dimensions of all S30s are the exact same. There will be some minor differences, but the engine bay size of a 240Z, 260Z, and 280Z are the same. 280Zs never had turbos. That didn't come until the 280ZX, which is a completely different car.
More people have installed the Apex kits now since that series started, but there still haven't been a ton of reviews involving usage.
The Toyota 1GZ was produced until 2016 and is essentially two 1JZs stuck together. It doesn't quite have the panache that a Ferrari engine would, but they're significantly cheaper, and any shop that works on JZs should be able to handle a rebuild.