Here's why:
* Different Fuel Delivery: The 305 uses a carburetor for fuel/air mixing, while an ETB system uses electronic fuel injection. The engine's computer controls the amount of fuel injected based on various sensors. The 305 lacks the necessary sensors and computer.
* Engine Management System: An ETB needs a sophisticated engine management system (EMS) to control the throttle, fuel injection, ignition timing, and other parameters. The 1979 305 has a very basic mechanical system, which is incompatible with a modern EMS.
* Wiring and Sensors: An ETB system requires numerous sensors (e.g., MAF sensor, MAP sensor, oxygen sensor, crankshaft position sensor) and extensive wiring to connect to the EMS. Your 1979 engine doesn't have these.
* Manifold Compatibility: The intake manifold on your 1979 305 is designed for a carburetor and likely won't be compatible with a modern throttle body.
To use electronic fuel injection, you would need to:
* Purchase an aftermarket EFI conversion kit: These kits are available for older engines, but they are expensive and require considerable mechanical and electrical knowledge. They typically include a new intake manifold, fuel injectors, an engine management system, wiring harness, and all the necessary sensors.
* Significant Fabrication and Tuning: You'll likely need to modify or fabricate parts of the intake system, wiring, and potentially even the engine itself to make everything compatible. Professional tuning will be necessary to get the engine running properly and efficiently.
In short, while theoretically possible, converting a 1979 305 to an electronic throttle body is a major undertaking far beyond a simple bolt-on modification. It's a complex project best left to experienced mechanics or serious engine enthusiasts with the necessary skills and tools.
