Some extra oil consumption info...
Correct type of oil and break in procedure to enable rings to wear into cylinder walls is needed to prevent oil consumption on sawa new engine.
Are the rings chrome or cast iron?
Chrome rings take more time to wear in.
Break in procedure generally requires a non detergent type oil for ring break in...no slippery synthetic oil... no long idling. Start the engine and run it at different speeds for the first hour.
When driving a new engine brief full throttle say up to 45 mph then coasting down to 20mph several times to twist the rings. This helps promote ring seating.
New rings contaminated with engine assembly lube will not seal up as the lube is so slick.
This can happen with a newly assembled engine on a stand sitting for a day or more, cylinders pointed down and using assembly lube not paste on all the crank journals and bearings.
The slippery lube runs down into the cylinders and rings. The rings will never seal up 100%...
Valve guides on a MoPar inline flathead are generally not a cause of excessive oil consumption IMO.
Proper guide and orientation install is critical on both intake and exhaust.
OHV engines require tight guides and proper stem seals most certainly.
JMO?