Engine swap for a 97 civic ex

I need a new more for my car the stock ex more is on its last legs I want to get dohc but I have no idea which more to get I want a b16 but I don't know if I get a b16a1,b16a2, b16a3 or b16a. I am new to the hybrid stuff and I have no idea what I am doing I just need to know which motor to get and I will have someone else put it in..

The motor you buy will have to be an OBD-II motor, and Legally will have to be newer than the chassis of the vehcile is it going into (so a 97+ motor). Any 97+ B-series will work (any 97+, JDM B16A, or a 97 Del Sol Vtec B16A, or a 99-00 Si B16A, or a 97+ B18B1, or 97+ GSR, or.....you get the picture).

Hey I just put a b18c1 in my 97 civ dx. It will just drop in but you will need some motor mounts from HASPORT.COM. It's also obdII. If you have any ? hit me up. It only took me about 3 days. I found it way easier to buy a wrecked car to pull all of the parts from I.E. axles shift linkage, ECU, additional sensor connectors for the new motor, all of which will come from the junked car. I bought a 97 gsr for $3,000 in Virginia and used as many parts as I could. Still I needed help from hasport to make the angle the engine sits correct. you can even reuse you radiator too. And the big brake kit from the integra bolted right up to my dx (what a sleeper---NO STICKERS--so watch out, if your in Columbus anytime soon.

And man does this bitch FLY!!!