OBD I to OBD II Conversion Issues

Something else I have been thinking about, is it has long tube headers and 2.5" dual exhaust. The oem O2 sensor is in the right bank just after the collector. I'm thinking that since it's only getting half of the exhaust flow compared to being in a factory y-pipe, it's not getting an accurate reading. I was thinking about adding an x or h pipe. Should I move the O2 sensor where it's reading both banks of exhaust?