Actually there are 2 other ways that are much easier ..legal ....and don't cost a bunch.......

1st....if your car is running absolutely perfect ....go get a pg7 or pm6 ecu both are cheap and will run a b16 ....this cuts the fuel curve and as well as reading only 1 o2 sensor...(no check engine lights either)

2nd ....e85...you'll want to do a mixture of almost 50/50....e85 of course burns hotter and cleaner lowering the hydro carbons and upping the oxygen output

..........an as for your car getting converted to obd-1 it wont change how your car runs ..only getting the ecu/ecm chipped will change it ...which is a far more expensive solution....although it is also another legal way of making it pass.