I made progress on the MAP sensor and IAC (idle air control) valve plumbing on my 8 stack EFI. The new Holley Terminator X ECU that the car is getting requires MAP and IAC, and they want them to be plumbed separately. The upper set of lines in the second photo are IAC and are cut to length. The lower set of lines are MAP and are equal length. Hence the bird nest underneath. There's no connection between MAP and IAC in the junction block. The brass hose fitting for IAC will connect to the remote IAC valve with 3/8" Gates vacuum line. The MAP sensor in the ECU will connect with more of the black 1/4" polyurethane vacuum line to the lower port in the junction block. I can add a remote plenum to reduce surging of the MAP signal if needed. Vacuum for the power brake booster is provided by an electric vacuum pump at the front of the car.
