depends on how much money ur willing to spend, u can go with a wide assortment of engines, just have to make sure that u use a good amount of usdm parts to make the car emissions legal in california, u probably dont want a b16a1 because it'd be very hard to pass emissions, as well as the zc so ur cheapo options are out of the question. ud be left with a b18c engine series as well as the ls engines from integras also could do a built d16 engine.