Nothing will just bolt in, but you could adapt it all to work. The oil pan will need to be modified, the A/C lines will be custom and mate the G body ends with the LS compressor fittings, custom throttle cable, clutch linkage or auto trans wiring, radiator (if LS F body is not a bolt in), etc. You basically need to engineer the whole thing and have a much greater understanding of late model systems than you would with, say a carb'd 350 SBC. In my opinion, it is worth your time if you enjoy this sort of thing and can afford the price of admission. If money is tight, pass on it.
As you probably already know, the LS engine offers a wonderful combination of power and driveability that is unknown in an older Gen I engine. Smooth idle, acceptable fuel economy, lighter weight (depending on model), and very powerful. I would go with an LS/6 speed combo if money were not an object for me. Preferably an aluminum block model as it would help with the weight distribution of the car which helps with traction, acceleration, cornering and braking.