yikes. The L28 is a pretty big motor. I'm not sure it would fit. That sucker is long and may run into the radiator. It also has a tall valve cover and may hit the hood. The L28 is retarded and has the intake and exhaust ports on the same (driver's) side of the head. This, along with the steering column and brake master might get you in to trouble. Increase the complexity if you go with the turbo version. If you clear all of those issues, then you get to make custom pipes, mounts, driveshaft, wiring, maybe a header. Doesn't sound too fun.

In conclusion, probably not possible, which is a good thing, because it's probably not worth it.