[Gaz64]

A carburettor can make more power because the fuel IS vaporised by the time it gets in the cylinder. The whole tract is full of vaporised fuel.
Have a look at individual runner outboard mounted injectors like V8 Supercar, F1, etc. The big horsepower cars run their injectors outside the trumpet.
Fuel ecomony is obviously worse with a carburettor because of wasted fuel going out the exhaust at valve overlap.

The difference may only be 10hp which would not be worth the loss of driveability, cold start performance, fuel ecomony etc compared to OEM port EFI.