I had or have the same problem on my 87 5.7, of the pipe broken at the valve cover. I finally used a few larger pieces of heat shrink tubing and not shrinking it so tight about 3/4" to 1" from the end and was able to slide it into the opening and it has worked for several years now. I still am keeping my eyes open at wrecking yards for the proper part. Let me know if you have any luck on the part, since i need one myself. Thanks and good luck.