Have you installed this on a 75 series? During my initial mock-up, it didn’t seem like it would fit my 1HZ.the combo water and vacuum tube is found on hdj78/9 trucks only 2001-2006 production. Buy one while you still can. 70 series vacuum reservoirs are on right side of engine bay. to install you must pull the top timing cover which needs a new cam shaft seal and some black fipg when replaced.
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It doesn’t quite fit on my 1996 HZJ75.I have put this 2001 later version block style on a 1992 and 1994 hdt block without issues in both a 74 and 79 series (narrow and wide) front end.
my 2006 conversion I JB welded the two tubes together which lasted 7 years until the JB weld broke down from the heat. The factory welded unit which is CHEAP was the better solution.