I have bought a project 1997 honda civic 4 door with an engine swap already complete I'm trying to find out what I have under the hood of this car it's fast .5 speed manual . Here is the numbers I can find . H23A then on the bottom of that is E303408 the head is stamped P13 year 99 with arrow pointing at a 2 . I love the power and torque it has. Please help