High-quality bulbs cannot make a bad lamp good.Aftermarket headlight, combined with high quality bulbs might be your next port of call, pricewise.
Some of these aftermarket parts don't even fit the vehicles for which they were designed.The purists will point out that the lower quality of the lights compromises safety through reduced beam pattern quality, increased glare amongst other things.
http://www.capacertified.org/press/CAPALighting3.pdf
This study indicates that a high percentage (100%) of the independently
manufactured replacement headlamps included in this study failed to conform to the
photometric requirements of FMVSS 108. This data was developed by testing five (5)
headlamps of each model and from each manufacturer for a total of fifteen (15)
headlamps. Because one of the supplier's headlamps could not achieve "in-vehicle
position" in the photometric fixture, no photometric data was recorded. This prevented
us from testing all 20 of the samples. This inability to achieve "in-vehicle position"
immediately failed the part with regard to the photometric requirements of FMVSS 108.
If you have UV degradation of the lenses (cloudy, yellowing) the first thing you could try is restoration of what you have. There are various kits out there that do a reasonable job for a fairly low investment, certainly less than a new headlight. Downside of this route is that you will remove whatever coating is left on the lenses, meaning that they will then degrade at an increased rate. There are treatments that slow this but certainly don't stop it. It is a low cost option, though, if this is the problem.
The headlights are really bad yellow color and one has a leak in it
There's only one kind of headlamp for a '97 F350. Definitely stick with genuine Ford lamps; the aftermarket ones (all of them) are garbage. You might find a better price online, such as here. You may want to consider putting in relays,see here for example, and you'll want to use either these Philips or
these GE bulbs. And it's very important to aim the lamps correctly with whatever load you normally carry present in the truck.