Yes the JH was designed with an engine bay adequate for a small block V8. Perhaps they would have used a 340 Mopar V8? They seemed keen to use Chrysler of Europe components. This is evident in the Interceptors built. Perhaps the Jackal, could have become the little brother to the Interceptor ? Anyway, this is my rendition, of a could have been ,JH. This car will weigh 2200-2400 lbs. Using R154 transmission,(direct bolt)and Mazda RX 7-II, modular, IRS. rear suspension unit and diff. Engine will produce 400+ hp. Support systems will be up-graded, to the task. Onward, Art G.