Si & HF MPFI?

I was at the junkyard the a week ago and came across an Si (ZC Head) & an HF. I always thought the HF's had Dual-Point until I looked at this one and noticed it was multi-point, except it was smaller and there were different spots for hose's on it. Whats the difference between this and the Si fuel injection, and do the HF's have more horse power than the DX's?

I think 88-89 HF had dual point and 90-91 HF had multipoint. Not sure about difference between Si and HF, but for sure Si has bigger/better ports and plenum design, and HF but not Si has EGR. Hp for 88-89: 62hp, 90-91: 70hp, 88-91 DX: 92hp.

all HF's are MPFI.

only the DX and STD models are DPI.