If you look at the VR38 valve cover, the oil spout is a separate piece attached to it. It is also angled further away from the plenum. Either that or your options for oil caps are very limited. GTM uses a very compact oil cap. It is ugly, but it clears the plenum. The VR38 engine cover definitely needs to be cut to make it easier to access the cap as well. Otherwise, it'll require removal each time.
Do you have the balance tube attached to the plenum? IIRC, someone posted white papers about the intake design of the VR38. It's crazy, but that tube diameter plays a role in affecting midrange torque. If anything, maybe you can fab a custom tube with an adjustable knob one can use to adjust the airflow through the tube. Just an idea... [shrugs].
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