Done it to stop cracks spreading in windscreens as well ;)
This is why you don't seam weld shells to strengthen them, you stitch weld them, if a crack develops it stops at the gap.
Had mine close to 45 degrees, the 3540 is a BB turbo so has 1mm restrictors in the Oil feed.
This means there isn't a lot of Oil flow through the turbo so the drain is less critical than a Journal bearing turbo but still needs to be downhill and unrestricted as possible.
Stock subframe and mounts then make adaptors from some 6mm plate.
Doing it this way means you can buy the parts anywhere if needed and it can be easily put back to stock.
http://ij.supramania.com/lsx044.jpg
On my 7M I clocked the turbo towards the shock tower and looped the drain back down to the Group A pan, there was no way known it was ever going to line up with the Block drain.
Personally I wouldn't use a 90 in a drain but looking at your header you should be able to clock the bottom of the...
Bit of a hint is a LOT of cars run check valves in the emission control lines that are fuel resistant ;)
I think from memory Hyundai's run a small CC with a check valve built in if that helps anyone.
Another point to keep in mind when Junkyard shopping is you need a CC for a Boosted engine as it needs a 1 way valve in the Signal line to cope with boost pressure.
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