A great Mopar mystery (at least to me)

I know this is a pain but you may want to get some original valve covers with the breather and the pcv in the middle of the valve cover. Given the car you might try some old power pak valve covers with the finned inserts. The older ones with the two "stove pipes" might still be too high, but the newer ones with a 'modern' pcv grommet should work fine.