possibly your lifters and cam may need replaced, try a synthetic oil to prevent changing immediately
I had a '93 I had at one time and amongst a lot of other Fords, but when I had the '93 I bought it with 17K miles w/ the 4.0, it also ticked seemed more than the V-8's did, so a had a few techs listen to it and they said it's typical for a Ford to tick like so because they have hydraulic lifters and will tick even more when it sits for a long period of time due to the oil getting to the lifters, especially when it sits overnight.
The ticking sound is coming from the valve lifters. When the oil filter is changed, air is introduced into the system, which causes air bubbles to form in the oil. This causes the valve lifters to "leak down", which is what causes the ticking sound. It can take several days for the bubbles to dissipate. It's annoying, but harmless.