B20B.
Basically just a larger bore version of the original engine. Bolts right in and you can use your stock wiring harness and ECU (no tuning necessary). Can find them at JDM importers online for anywhere from $300+.
Since your car is OBD2, you only need to swap the upper motor mount bracket, intake manifold, exhaust manifold and the crank pulley (the one on B20 is larger and will overdrive your alternator). If you’re keeping a/c and power steering, move the brackets on those over as well.