A friend of mine had an allison V-12 that was mounted on a trailer, all detailed up nice-n-pretty, ready to run. It had zoomie headers (24 pipes straight up like a tractor puller!) and FOUR Holley four barrels for carburetion. He would tow it to car shows and cruise nights behind his rod. Man when he fired that thing up it was ear splitting. Sold it to Al Little of "Big Al" drag racing fame a few years ago so now it is on the left coast. Selling price was in the five figure range. Cheap.