[Rotary Evolution]

i don't recall any of the rear ports having vacuum, i use them for injector air bleed ports and the oil injector air feed port. the front upper and lower and the ones on the passenger side of the LIM split/ACV port are the only ones i use for vacuum+boost.

the orifice you may be able to find in the help section of an auto parts store. it just looks like a vacuum tee with a brass insert in one end(small hole drilled through), your original pressure sensor hose may still have an orifice in it, it is located about 2" upstream from the sensor in the vacuum hose. a vacuum line filter also works but they are a little more difficult to find.