How much boost?

I have a D15B7 in my car and i know it will probably blow up no matter what but im counting on it.How much boost do you think I would be able to run in it?Its also an automatic.I had an idea of maybe 8 psi.Once this motor blows I want to put a B18B in.Im willing to spend however much I need to I just want alot of power.

unless you build the internals and get proper fuel management and intercooler. i wouldn't go over 6-7 psi