I had a specialised 1900 bottom end in my track car, with subtle mods (nothing too extreme), it made 240bhp at 15psi and when i sold it, had done 10,000 + miles on track and was as good as gold. Regular set ups by Jamsport (once a year) kept it running at its best, and to the casual observer, it looked like a standard cvh turbo engine in the bay.

Bear in mind this was back in 2001 - it was strong money back then, and ZVH engines were only just becoming popular.

If i was building one today, id be inclined to build a proper ZVH with forged pistons and steel rods, probably for less than the 1.9's cost nowadays.