sts boost question

How much boost do you guys think that I can run safely with this setup?

Stock bottom end
6.0L heads with MLS gasket estimated compression 9.1 to 9.3
gt67 turbo
Methanol
42lb injectors
255 fuel pump
boost referenced fuel pump booster
Ls1edit tune
Plus a lot of other stuff that doesn't pertain to the turbo setup. I blew a head gasket on the first setup probably due to the shaved heads, 11 to 1 compression so I swithced to the 6.0L heads and bought a big turbo cam. I am going to install the methanol injection soon and get a new tune and I want to know what you guys think on how high I can go with the stock bottom end. I was pushing 500 rwhp at 5.5 pounds of boost before but I want to turn up the boost to make up for the lost compression.

8-10psi? I would think at this point the stock pistons are your biggest limiting factor.

Yup, the stock pistons are the weak point when it comes to any detonation. With the meth and a good tune you can probably get into the 12psi range, but again it is in the tune. We have seen the methanol fend off alot of detonation.