Lifter tick (I think)?

Any idea on ways to calm down lifters ticking?

Seem to come and go, only really when engine is on light load and oil pressure is up.

At idle is quietens down, if you stamp on the throttle and have a bit of fun when you go back to cruising it can be very loud (peas in a can type loud)

Then all of a sudden it will just vanish immediately and completely at that volume.

Mild 1970 318 with headers and intake. with stock valve train. And 4 speed.

Picture shows oil pressure at idle, and oil at operating temp 80-90⁰c (185⁰f)

And cruise it's up around the 35-40 psi (which I think is pretty much on the money no?)

Oil is 20w50 weight


Edit*

I will mention it's running a little rich at the moment and the oil is smelling a bit of fuel so wondering if the gas has diluted the oil a bit? And the oil dosnt have it's usual properties to aid smooth running? A fresh oil and filter change is on the cards today. But thought I'd arm myself with somethings to look for/try in the meantime

Eventually over winter it will have new lifter as want to change the heads anyway. But that's another step for another day