Owners of P30 454 chassis, what are u setting the timing at?

Mine is setting around 12* before TDC. I had my distributor recurved a couple of years ago, I believe I could get another degree or two more but it runs great and no pinging on 87 grade gas pulling a 5000 lb trailer.
Also with the GM setting you could always go down the highway at 55mph and and hand time it like I used to do with my 66 chevy van:-)