Injection systems are only worth the amount you put into them
The bulk of your budget is going to go into an ecu, harness, injectors, throttlebody, fuel rail, lines, fuel pump and fuel regulator, and in some cases an ignition.
None of that will be cheap, and you'll still need a palmtop to program your fuel map. Then consider that no motor is going to be the same so you will need to schedule dyno time with a load cell dyno and somebody who knows what they are doing.