Thats right thats what I used.when I bought my 2g it was doing the same thing as yours and when I pulled the tranny I only had two screws and no dowel pins . luckily I was able to separate the tranny enough to slide in the dowel pins
I dont think they sell shims for our startes I looked all over and didnt find any when my starter was grinding so I added washers to the bolts to work as shims and it didnt help.the starter bolts keept getting loose so i pulled the transmission and guess what? I was missing the starter plate...
I had the same problem when I bought my 2g eclipse I had more problems than I think you do but make sure everything is there and thight.i pulled the transmission and found out I was missing the starter plate,two transmission bolts,and the two dowel pins.that solved my problem.
If u buy the pipes without the bov flange all u have to do is take it to someone that welds aluminum and ask them to do it for u.thats what I did and the guy charged me like 20$.