Block Heater Install

I posted this question awhile ago and no one replied so I figured I'd give it one more try.

Has anyone ever installed a block heater on one of the old 4 cylinder pick-ups (1993). Is there a plug somewhere on the block where I screw the heater in?

Wanna' take care of this now so I'm not crawling around under the truck in January when it's -15ºC.

Thanks.