Most guys just piece something together, as you'll need front springs, shocks, steering, possibly brake lines, etc. it is possible to fit 35's with 2-3" of lift, but it's tight.
My 91 had 315/70R17's (34.5") on it for a while, I really like the way it looked, but with 3.07 gears there was a noticeable power loss due to the larger rotating mass of the tires. I prefer something in the 285/70-75 variety. Still decent looks at being a full 33" tall, but a lot less mass, as even some of the fuel mileage came back when I made the switch back down.
This is what it looked like with 315's...
This is what it looks like with 285's...bad pic....
As for your 89, if you end up going with 35" tires, they'll suck up a fair amount of power, especially with a 727 transmission in it. Another thing to consider is that running those old school "turbine wheels" (what they're called around here), you'll need to swap out lug studs, just for the safety aspect of things. Those wheels are fairly thick, and with the short 1/2" diameter factory studs, and even the special lug nuts, there may be not enough thread engagement and the truck could run the risk of going into what I call "tricycle mode". Not trying to sway you away from running 35" tires, just giving you my two cents on the matter