Okay I'll preface this with I know a few people on here told me to avoid the IPD header with their Weber setup. The other day I was looking at the crack in my exhaust manifold and noticed it had grown a lot. The previous owner tried to weld the crack which obviously doesn't work well.
I went ahead and ordered the IPD header and started fitting it last night. Initially I bolted it in place and then tried to fit the intake manifold. It wouldn't go on no matter what I did so I tried putting the intake on first. That didn't work either so I took a step back to see what was going on.
After a little searching and feeling, I saw that the intake was running into the exhaust manifold flange on the underside of the head.