I have heard yes, and plan to do something similar in the near future. You'll need the 4YE block, inlet manifold, injectors, fuel rail, fuel pressure reg, loom, all sensors and computer. Basically you'll need an entire engine. Plus you'll need to upgrade to an EFI fuel system.
Or Toyospares in Melbourne do an upgrade kit for about $800 with all the injection gear and wiring diagrams to make your current 3Y injected.