Buick 3.8 V6 in a 1973 Chevy LUV pickup, I've heard stories of V8 engines put into these little trucks but never have seen one. I remember there was a trap door in the bed to access the battery.
My old BMW mechanic built a 70 Ford truck with a 2002 BMW M5 v8 and manual gearbox. It was a prerunner/desert truck. Pretty odd for sure but he was a BMW mechanic and his brother built Baja prerunners.