Well the prelude has a great motor to begin with, H22A, let me ask you this, what kind of set up are you planning, All motor or fored induced. Although the engine has a great displacement of 2.2 liters, its heavy, i would opt for a b18c5 (type r) or a b18c1 (gsr) the difference between the 2 is that the type r revs 300rpm higher thanks tothe lighter cam shaft. If you are planning to boost your engine, 1bar (7psi)-2 bar (14 psi) the prelude is a good engine to work with since the bigger the diplacement, the faster your engine will spool, however if your gonna run high boost applications (21 and up), b16 or b18 is the way to go since the cylinder walls are thicker and can handle the load better compared to the H22