The proportioning valves between cars with 4discs and those with 2discs are different. You did right by taking the teg prop valve. You might also want to check that the clutch line fitting is the same size for both master cylinders. I know that when swapping a 3rd gen teg MC into a 5th gen civic that the fittings differ in size and location.
As for the MC usually youve gotta replace the booster since the two wont line up right otherwise. Even if you got the MC off of an Si it might be using a different booster.