retorque heads to solve issue?

Looking at the photo I don’t believe the OP has any head gasket issues. It appears to me it’s weeping a little oil along the china wall.

As far as retorquing the head gaskets goes I’ve only done it on one engine. It’s currently in my Dart, I painted a mark on the nuts and head, then broke them loose one at a time and retorqued them. Everyone of them moved about 1/8 of a turn past the mark.

None of my previous engines ever had any issues because the heads weren’t retorqued. Having said that I always use Fel Pro 1008 head gaskets. If the gasket manufacturer recommends doing it, that’s what I’d do.