Max HP limit for 360 magnum stock bottom end?

The reason I was asking is because I'm currently running a Turbo and Last time I tuned it everytime I added 1 pounds of boost and pulled out one degree of timing I was gaining 30 to 35 horsepower. It was like a licence to print horsepower.lol
I have been running 430hp at the wheels for 2 or 3 years now in a 3250lbs car.
With the easy horsepower gains on the last tune I ended up stopping it at 620 rear wheel horsepower as the A518 stock transmission started to struggle.
I have read guys have been running 100 horsepower per cylinder but I don't know if that's at the wheels or at the crank. I imagine that's about where I would be 800 at the crank or close to it.
I know once I get used to this power I will probably be looking for more lol but I don't know many people running that sort of power on stock bottom end.
A big problem with one max hp estimated limit for all applications is that turbo horsepower is easiest on the bottom end, followed by belt driven supercharger, then the toughest on the motor is normally aspirated.
Stress levels per Hp vary because power to drive some superchargers is not recorded on a dyno sheet.