RS1800 was sold as XR2i 16V over here with no limited numbers.
The 1.8 16V 105 PS spec as "Fiesta S" without the XR2i bodykit.

Differences were:

Camshafts
ECU
Throttle body
Piston cooling oil spray jets (won't give additional power)

With the 130 PS spec parts and your mods you'd probably see the claimed 130 PS then.

These engines were known for being a little bit low on standard power usually.