.20 over stock pistons in my 4G64

[gunner12]

So I have been working on my 2.4 build and im at the point of buying the pistons.
I know forged is the best option, but as most of us we do not have the funds for them. So what I would like to do is make sure the engine is in a (Controlled)
Boost, Air/Fuel environment. This motor will be im my 87 montero 4x4, I have a starion 2.6 in it now but like the DOHC option much better. This motor will make a lot more lower end torque and will be a good upgrade from my current set up now.
This 64 will not see over 5500-6000 rpm at most and around 12 psi of boost.
Will this be a safe running stock parts?