WOT timing on a blown stock LT1

What kind of maximum timing advance is typical for a stock LT1 with 6-7 PSI of intercooled boost?

Stock 96 Impala SS LT1 engine
P-1SC ProCharger
28-29 degrees at WOT
I move about 370 GPS of air by the time it shifts around 5500 RPM.
OBD-I PCM (converted to use the OBD-II knock sensors)
LT4 Knock Module already installed
93 octane

I'm getting frequent knock counts and resulting KR that goes away if I pull a good amount of timing with my BTM. If I'm should be running a lot less WOT timing than I currently am, great.. I'll just have it tuned accordingly. If I should be able to run 28-29 degrees of timing at WOT, I need to figure out

If I run the full timing the car hauls. Naturally, with the BTM pulling lots of timing the car isn't quite as quick as far as my butt-o-meter is concerned. :D

Just wondering how much timing (without any resulting KR) people have known to be able to run on a stock LT1 with 93 octance and a similar 6-7 PSI of maximum boost.

Thanks Dave

Also noticed that I'm always running in long term block 131 at WOT. Don't know if that indicates anything in particular...

Anyone?

Would it be normal to expect knock retard from the PCM at 28-29 degrees of timing with the above setup?

I would not use more than 24 degrees.

Rich

Also, a 131 is a bit lean before compensation. The a/f is not at its potential.