If you have a y7 intake manifold, the throttle body opening will be vertical. If you have your old VTEC (not vtech) intake manifold, the throttle body opening will be horizontal.

I/H/E will not give you very much of a power gain, especially with that engine. I would save your money for the timing belt replacement.

As far as modifications go, what are your goals for the car? Most people will advise you to turbo it or swap. I advise you to save your money until you have done more research and have a definite plan.