Swapping in a big block

I don`t see that much hp either in that combo but regardless you really need to think your build through, especially if this car is a drag strip only car. An engine with any real power is going to target every weakness in a 318 Scamp. See if you can find a friend or shop that can educate you on the modifications you`ll need to safely install that 383. Perusing this website alone will help a lot. There`s too many things to list ,but look to replace the complete rear end, driveshaft, add frame connectors, tubbing?, frt.brakes?, radiator?, motor mounts, torsion bars?, headers/manifolds, wheels and tires, and the list goes on. Oh, it`s costly too ,so be prepared to say goodbye to a lot of greenbacks. Here`s another thread with some good info: http://www.forabodiesonly.com/mopar/showthread.php?t=6219