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Just some ramblings ... my humble opinion here ...
I wouldn't do anything "custom" to it; the truck looks to be in excellent shape. What I *would* do is peel off those side window "shades". Stepside beds are kinda rare to begin with but, matched with the extended cab and the small V-8, my guess is it probably puts the truck in a "rare" category. What's the trim level? There's a website VIN decoder called "Compnine" and the results also tell you how rare your truck is, compared with the total model year production, based on the options on it. Compnine has been around for awhile and used to be free; today, for $5, you can get up to 5 decodes without a subscription. I had my '98 GMC done just to get a list of the options on it ...never did I expect it to fall into any kind of "rare" category but: "Rarity ...There are 4 1998 P/UP C1500 Reg Cab Std Box vehicles (0.004%) matching your exact options list. There are 10 (0.010%) with at least as many options." Thus sayeth the rarity proclamation of the report. My truck is one of four produced out of the entire 1998 model year.
The wheels are definitely cool, again, because you don't see this setup very often. The 5.0L is what it is ...I have one in my '98 ...decent power but not a motor worth "hot rodding". It seems the goofy (and cheap) factory Central Sequential Fuel Injection either works or doesn't; I'm guessing you replaced it with the upgrade kit. The one in my '98 seems to be working well enough not to convince me I need to do something about it. The 4L60E is about bullet proof ...maybe consider installing a "Corvette servo". Be wary of catback "performance" exhaust systems, especially with the extended cab; they can create a lot of annoying resonances. Been down that road.
I'd go through the truck and do the "unglamorous": change all the fluids & filters, exchange the transmission fluid (that replaces all the fluid), install new plugs (just get the OEM AC Delco's) and wires, cap and rotor (in these days of distributorless ignition systems, it's easy to forget about servicing the distributor ...I had a rotor fail on me because I'd forgotten to swap it out ...it lasted about 5 years before it failed). I'd replace the three O2 sensors; they may not be triggering a CEL but they are kinda like spark plugs in that they degrade slowly over time. I just swapped in a new set (in conjunction with installing a new cat/headpipe/midpipe assembly); the difference is noticeable.
What amazes me are how many folks stop and ask me about my truck. I've had more than a few unsolicited offers of purchase. These last of the GMT400's still remain some of the best trucks GM made ...certainly way better than the faulty techno-crap laden behemoths GM is cranking out today ...and the clean style of these last of the 400's is still attractive.
