318 oil leak

From your description, I agree. Front seal for the Harmonic Balancer. It is pressed into the timing cover from the back. It appears some oil is being slinged upwards as well and then dripping down. This also aligns with this seal leak. Cheap fix but removal of front pulley and balancer,, brackets, water pump and timing cover is required.
If it was the front main seal, you would see oil coming from the rubber seal and running down oil pan. There would also be limited oil spray and just running down oil pan.
If you replace this crank seal , inspect the Harmonic balancer for wear where the seal rides. If there is a grove worn were the seal rides that must be soothed out.
Try this link for pictures.
https://www.vanning.com/threads/ubbthreads.php/topics/528275/re-318-front-crank-seal-question