Chris (Gentry), you should design to drain the turbo oil into the pan by
gravity. In my case, my TO4 turbo was about 1" above the oil level and about  a
12 " run. I used a 5/8" ID drain oil line that proved to be inadequate. I knew
it was inadequate because I was getting some light smoking out the exhaust. Like
you, I had very little room to work with. I added an electric pulse type
scavenge pump which works in parallel with the gravity drain that I got from
NAPA which solved the problem. It is a possible that the pump will fail, but the
turbo will drain adequately without it.

I would not have done this if my oil level was at the same heigth, or above the
turbo drain, because it would likely overheat the turbo bearings because you
would then be pressurizing the drain line. Also, don't forget you can't run the
drainline uphill-it needs to slope down the entire length.
Chuck

 
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