You're doing a hybrid so you are stuck with what you have. If your heads have three oil drainbacks then you are probaby fine. Run quality oil. It should not cause any more worry than your 2.5L had since it will be oiling and draining exactly the same.
Now if you wanted to improve drainback you can tap holes in the sides of the heads at the rear and run tubing down to the block skirt to drain that oil that could be pooling up in right hand turns. No one has done it but it is do-able.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
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'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black