As I've already stated, I have a K now, and very pleased I am with it. But when I did have my xflow, it was re-built with the help of Revin, to 155bhp spec, with forged pistons, and a 3D mapped ignition system. The grand total of this re-build was £1200, the engine was then pretty much bullet proof. I also had rose jointed rear suspension, and to be fair the ride was no different to my de-dion ride now.
Try re-building a K for that kind of money