The throttle body position differs about 3 inches between the stock and Blox/Skunk2 manifold. You may have issues getting the stock airbox to fit the new manifold, but it can be done.

A chipped ECU is highly recommended because the vtec engagement should be changed for maximum power since the IAB's are eliminated. Your current ECU is worthless, though. You will need an OBD1 P72, P28 or P30.

For the manifold swap, you will need an ITR throttle cable, ITR throttle cable bracket, and a non-GSR throttle body pulley. All the hoses and sensors transfer over.

I would really recommend against the manifold until you have upgraded cams because you will see a decent loss in low end power with just the manifold on a stock engine.

Here is a very good writeup for the install: http://technet.ff-squad.com/how-to/sk2im/