What are some current specs on your engine? As in what carburetor (or fuel injection) are you running, do you have headers, ect.
In my opinion, the 460 has enough torque that you can move the powerband up for some substantial power increase while still having more than enough torque down low. A mild camshaft, some headers, and a good 4 barrel carburetor/intake manifold will make worlds difference for a budget.
If I was in your shoes (assuming the 460 is a stock carbed pre-'87 set up) I would look toward a Lunati Voodoo cam/lifter combo that makes power from idle to 5,000rpm (dur @ .050" 207*/213* & .503" int / .535" ex lift) I run a voodoo camshaft (2200-6400rpm) in my small block ranger. Its got a great torque punch for a small block, and pulls very hard up to 6500rpm. Anyways, some other benefits of the voodoo for your application is the dual pattern lobes, which will give it a lopier sound while retaining driveability. Also, it pulls great vacuum so carburetor tuning is easy. T&B performance (the engine shop I use) has built numerous engine combos and they tend to favor the comp energy series and voodoo camshafts. Infact, they just finished building a BBC based dart block with goodies including a voodoo solid roller camshaft (good to 7000rpm) with a twin procharger set up. The fluid in the dyno boiled over, so they went to a bigger dyno shop. It made 2800hp.
Find some long tube headers that will fit in a ranger, or fab/modify some.
You'll have good luck with an edelbrock performer intake manifold and I would opt for a Holley Truck Avenger 670cfm carb.
If your truck is fuel injected, check out Banks performance. If S&S cycles honers their promise to continue building Crane Cams products, you can try a truck "power max" camshaft.