The motor that resides in the car came from a '67 RO/WO race Hemi project. It's now fortified with all the race parts that had been on the other engine back in the day. W.D. originally just wanted to buy the engine from the Challenger because it was the correct one for his Charger resto. To get the engine, he had to buy everything, and the Ro engine replaces the removed Charger engine. Confused yet?