ford cobra

So I am putting my motor to gather and I want to know has anyone here ever broken a stock crankshaft in a 4.6 2v/4v? And if so at what HP where you at?

I am in the Virginia area please be as well or willing to travel to see it. The car is being garaged currently. I bought this car back in 2012 when I was active duty with 40k on the odometer it now has 60k. Ive tried very hard to take care of it and garaged it as much as possible and when not i...