Stroker magnum oil mods?

Check the size of the oil passage from the mains to the main oil galley.
Deburr the area at the main oil passages under the main bearings. Open up the main bearings oil hole to the size of the passage under the bearing in the block.
The suction side of the pump is the most important. If using a rear sump pan use a bottom plate pickup. A HV pump with a stock tube will not move more oil than a stock pump with a larger pickup tube.
You might drill a hole in the back side of the middle main bearing to oil the thrust side of the crankshaft.