I just did my oil change (20 miles)

Before that I had about 5 miles on the oil change (long story)

When I started the car after the cooling system replacement (Thermostat housing, Thermostat inlet, Thermostat, and water pump) It was ticking. Added oil and slightly overfilled (oops) and it burnt off the excess (most recent oil change was after burning, filled properly) and it still ticks. (It was ticking before the slight overfill and 2 oil changes) The exhaust rattle is also new. Any ideas?

B14 (‚Äė98) sentra, GA16DE