As johnny says, we did a kompressor black top mondeo engine with 465bhp and over 500nm on a totally std bottomend.
The oilpump keept on going as we reved it over 8000rpm but the rods were fine, no problem.
I“d say 350-400bhp max and not over 7800rpm
After that we wanted to turbo it, but dident finish the project

Here is the manifold we were gonna use