68 cuda front suspension questions

our 68 was just thrown together by the po.it had a 440 and was just a racecar.he changed the k member and put a 318 in it.it has a brand new exhaust all the way back and new headers which seem to fit very well.we are trying to put the front steering together and having problems.1st we bought a new idler arm and it came with 2 heavy washers.do these go inside bracket or on the outside?
once it is on (even loosely)it seems to hit the header on the pass side.it does look like it will just clear the oilpan though.can anyone direct me to a good writeup with good pictures for assembling this ?