that was the whole point that Ben was trying to make in that mag, you can put any engine the Escort really, but it doesn't mean its still an RST, just the shell, which to me is right.

It should be about how far you can push the original CVH engine.

All the others are Escort/whatever hybrids...

For example if someone stuck a phantom jet engine to the top of an RST and hit Mach2, would it be fair to say its the fastest RST in the world?

No...