You gave no details on what you have.
I'll assume you have nothing
well, at least a '81.8 - '83 turbo ZXT
If you have no intercooler, do not-repeat-DO NOT raise your boost over 9psi.
get an intercooler along with a rising rate fuel pressure regulator, that way you can run 12 psi easily, even 15 psi.
provide more details in order to be able to tell you more