Just for clarity:

USAC and POWRi

2.0 Focus is allowed to Port and Polish Head (must be Ford Focus 2001-2004)
Aftermarket Rods-Pistons-Cams-Springs-Valves-Retainers-Keepers-Cam Gears
Stock Crank
Stock Block
Bore - 2.011

This is so the Focus engines will not become obsolete and can be upgraded no need for you to buy a complete new engine to stay competitive.