emjay
+1y
If you are going to use the injected setup for a 5.0 you will need the corresponding computer for the engine, or make your own (IE megasquirt.) You would follow the wiring for the 5.0 engine to make it run efficiently, a custom speedometer cable/trans gear will need to be made to make the gauges work (plus additional oil pressure, battery, and coolant temp sensor installed to use factory gauges.)
The stock B series end would work and handle the power, it is commonly done. You would also need to make a custom drive shaft, transmission crossmember, and motor mounts.
This swap has been done before, both EFI and carb'd. The wiring for the carb setup is going to be MUCH easier and still give you plenty of power. You would need to have the speedo gear and drive shaft work done.