318 timing chain.....and why the engine should come out.

glhx said

I can tell you this oil was new and might have a couple of hundred miles on it. It’s black and thinned out

But some of that is gas from where it ran rich trying to tune the carburetor and set the timing.

Click to expand...

I suspect more than just rich from carb tuning..... the deposits you see look to be from a regular diet of gasoline in the oil. Does not look to have been going on too awfully long. But I would be looking at the fuel pump for gas leaks, and the carb for leaks down the throat(s) after it is shut off.

Gas leaking down from the carbs often leads to a rapidly worn cylinder. So pulling the heads and looking at the ridge on the bores and checking the diameter is not a bad idea. If I found a lot of ridge in a bore(s), I would not change bearings or rings without removing that ridge.