ok, so what 4age do you have?
if your rebuilding, and got a 42mm crank u want to use late conrods, they are plenty strong, and lighter. some good cams and bit of head work and u should see 160 odd. if uv got a bigport head try and get a small port.
a TRD 0.5mm headgasket will help the compression.
skys them limit really!!
unfortunatly with n/a any increase means $$