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Maybe, maybe not. Either dig around up front looking for the plug or crawl under the truck and look at the oil cooler (the thing the oil filter screws into). The plug heater cord ties in above the oil filter so trace it forward from there if you have one.
When I ordered my truck brand new, the block heater was an option. $55 if I recall correctly. Most dealers ordered them, even in Texas, but it wasn't a required option in either 99 or 02 when I ordered those trucks.