The numbers you are looking for are not far off if you are judging at the flywheel. If you want the 302, swap a 302 block in and put all the 289 front accesories on it. Then nobody can tell if you have a 289 or 302.
If you started off with a 5.0 engine, the heads are better then the older ones and the engine would have the roller cam right from the factory.
I am a bit partial to this conversion....cause I have done it to mine
Ryan