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If I get this straight, you want to run a late model computer controlled, fuel injected 4.3 Vortec from a truck that you want to put into a 1980 Monte Carlo. This will connect to a Turbo, 350.
To some extent this depends on where you live and what SMOG checks if any you're subject to. The basic problem is that it’s a truck engine, which is illegal to retrofit to a passenger car.
If you live outside the restricted zone, the much simpler solution would be to carburet the engine. Bringing a fuel injected engine into a non injected chassis is a lot of work. You will need as starters the entire engine and transmission wire harness from the donating vehicle. You will also need the fuel tank which has the special high pressure injection pump. Just any pump won't do, it has meet or exceed the injection systems requirements for pressure and volume. There is a regulator which will set system pressure, but the pump can't be of such big input that its stalled against the regulator, thus get the pump that goes with the engine. You will have to run fuel lines to the EFI, depending on year there may be a requirement for a bypass from the regulator to the tank.
The Turbo 350 is not what the computer is looking for; it's hunting for a 4L60E. Therefore there's a bunch of unused power leads that would connect to the 4L60E's shifting relays. I haven't done this kind of a swap, but I rather imagine that the computer will need an inductive load on the unused leads of the size it's used to seeing to prevent burning up the output drivers and possibly the circuit board they're mounted on. It would be like running a high power stereo without the speakers connected, or the wrong impedance speakers. Eventually something expensive will go up in smoke.
The Turbo 350 does not have the electronic sensors within it the computer needs to manage the fuel injection. I know some of this can be overcome but getting the sensors and clock driver conversions is mighty expensive. You're looking at the better part of a grand just to get output data from the transmission to the computer. Or you can get the gearbox out of the pickup which will have all the electronics the computer needs for data input.
You will need the manuals for both vehicles, pounding the electrical systems together is a complex effort.
Frankly, if you can't or don't want to carburet the engine, I'd forget it, this is an expensive, complex swap, especially if you're not familiar with these things.
Hers a couple books that will be useful if you push ahead with this. They're intended for V-8 swaps into S-10/15 pickups, but the 4.3 is kissing close to the same problem.
http://www.jagsthatrun.com/
Chevrolet S10 Truck V8 Conversion
Chevrolet TPI & TBI Engine Swapping
Bogie
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