where the 2 tabs are welded to the rocker cover and the charge carrier pipe bolts down too , ive seen them leak from there over the years , so if its not your oil filler cap its probably the rocker cover itself .
Thanks, will check that and have it rewelded just in case. The more I look at it, the more it feels as if it is indeed coming from underneath the tabs. And if one is broken, whatever hit it could easily have teared the rest off and open the leak.