is it a jap ecu then yes it will give you the power but you will have to run 98ron fuel
My 4age has a rwd ecu (96kw apparently) and i used normal unleaded for 6 weeks, no drama's for me, although i know use 100% Ultimate (BP) with a little timing change for the best.
You gotta remember that back in 80's the fuel quality wasnt all that good, unless you had a leaded motor.