gsr crank would have to use gsr or type r rods. R/S would be 1.58/1

B16A can be bored to 84.5, and you could use a B17A crank. It would bring you to 1.8L. B17A rods will give you a r/s of 1.68/1 and would be your only choice other than aftermarket. Although the old prelude(B20A) might have rods near the same length and they should have the same size big end.

For 84.5mm pistons aftermarket is your only option.