Building a reliable driver with stock crank and rods. What mods to the oiling system would be the most benificial besides the oil pump blue printing, which I have done. Open up passages, install restrictors somewhere, what? Magnum 360 with EQ heads.
No need to do any more oiling mods. The engine doesn’t need it.
The heads should just be well prepped and looked at.
For more power from the heads, nothing more than a good valve job is needed. No porting. The heads are capable as cast to support over 400hp easy.
I equipped my stock 5.9 with only a 750 AFB, RPM, Hooker Super Comp headers at 1-3/4 into a 2-1/2 dual exhaust.
This is a 300hp engine all day long and has been excellent to me for a long time now.