I completely understand the lack of space in the engine compartment, I almost bought a 47 dodge truck with a 273 and there is not alot of room, bb engine it has to be tight.
I guess the main thing is the location of where the turbo is going to set.
The turbo must have adequate oil drain back or it will become saturated with oil.
I just built a twin turbo small block, and use a 4an line into the turbo with a 6an drain back to the timing cover, and my local gear head buddy says I should have used a 12 an on the drain, but there was not enough room for the 12an fitting on the timing cover.
I do not have the oil lines ran in this picture, was going to wait until I install the engine in the car, in case I had to move something. You can see the blue 6an fitting on the timing chain cover in this pic, there is one on a fuel block off plate on the other side of the engine.
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