I own a 95 civic ex coupe with delsol 5 spd tranny, short throw shifter, aem intake, tanabe exhhaust, tokiko shocks, and blox front and rear camber, howver the engine is only a d16y7(diff head, forgot what kind, japanese vtec)

I can't decide which engine to go with. Would someone with decent civic knowledge explain the pros and cons of these four engines

B16a2

B18c gsr

H22a

K20a