This is not going to be easy. You have several ways to do this and it depends on how this seized up on you. Check your oil, drain the oil and see if antifreeze comes out with the oil. If it is all oil, then this is good. If antifreeze is in the oil, then the heads have to come off.
Take out the sparkplugs and then try to turn the engine over by taking a breaker bar to the crankshaft pulley bolt. By hand turn the engine if you can. If no luck spray WD40 in the sparkplug holes and try again. You will need to start disassembling the engine until you find out where the frozen parts are.
Your truck is 27 years old. If the engine is severly damaged, you would be cheaper off to find a Salvaged motor at a place like car-parts.com. It costs so much to rebuild an engine today that fixing the old one will cost more and many of the parts will still be the same old parts you started with.
Good luck on this repair.
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