What is the horsepower limit for a "109" block?

[1983.REGAL.LC2]

Not asking what is possible, just what a practical limit horsepower for a very reliable motor for long term use. Getting ready to build the motor for my 83 regal LC2 conversion. Would like to set it up for around 450 to 500 horse power.

 

[bison]

550hp with zero detonation

 

[1983.REGAL.LC2]

550hp with zero detonation

Thanks, Here is a picture of the 1983 regal yet to be finished.

 

[85typet]

nice regal