One of the issues with an older vehicle is there is an almost never ending list of projects. At this point on the Bronco I've done most of the reliability and off road performance mods I'd like to do. The focus now is on drivability. The rig is still street legal and it is fun to drive but there are a number of things that limit where and how far I can take it.
1. The gauges don't work. Most importantly the temp and battery gauge don't work. Oil pressure kind of works. If I'm overheating or the alternator isn't charging I wouldn't know it until the vehicle dies. Not a big deal when going wheeling with a group or driving around town where friends can help tow the rig back on a weekend. Not great if you want to enjoy cruising with the top off on a work day and something happens.
2. Various leaks. I have a puddle of what appears to be power steering fluid that has slowly puddle below the Bronco when parked in the garage along with a few oil spots. On an epoxy coated floor with some tubs under it there is not a big issue. Nor is keeping fluids on hand. The pain is people tend to get pissy about your vehicle leaking fluid on their driveway or in a parking structure.
I think the 2 main leaks are from 1) the power steering hose and 2) oil sending unit leak. Tho I also think it could be a seal or gasket somewhere; haven't really looked.
3. Blower motor. The a/c and heat work but there is no motor to push the air. It helps a little when the weather is too hot or cold but it would be infinitely better if I fixed this.
4. Functional fixes. The driver door handle is broken so you have to roll down the window to open the door from the outside, open it, and roll the window back up. Also the rear window is rigged with a lamp cord and a jumper battery pack to open and close it but having it wired in to a switch would be much better.
That is the short list. The long list includes things like a new stereo, seat covers, headliner replacement, rhino lining the interior, and more things that have probably slipped my mind. Like I said you can keep modding forever.