Here is the mod I did on the headers to allow them to fit. It should be enough area to seal...
-A stone grinder for a Dremel is almost exactly an M10, for decent finishing.
I also drilled my R200 VLSD which came out of the Q45. I am going to eventually pick up an aluminum s13 one piece, I just didn't want to drill it after I installed it..
BTW(that is a hard body nissan shaft I used for reference, same bolt pattern)
Power steering turned out to be cake...
I was able to use all stock lines PS lines. I think the one I ended up using for pressure was off of the q45... I've got quite a few parts in my bin.
The KA pump nearly identical to the VH41 pump, the KA snout is longer, and the pressure fitting is oriented differently. I swapped that fitting onto the VH pump, and ran the pressure line under the oil pan. I cut the return line on the chassis on the passenger side(I hope it doesn't reduce too much volume).
(KA pump, VH41 pressure fitting)
(VH Pump installed with KA fitting, angled it back so that it would reach the line, and orient the "tit" correctly)
and here are some pictures of the headers installed...
So not a great pic, but you can see the kind of clearance I am working with, I may have a 1/4 inch total between the steering column, LH header, and the starter. I hate it, but I have decided to run solid mounts due to the tight tolerances. I don't want to be driving down the road and the column start to rub something. I am in the process of ordering xcessive mounts(I don't trust myself when its this tight, and I don't have a lift)