IMO the 428 CJ's are a good motor to make some horsepower with. The shorter stroke of the 429 makes it a quicker revving motor, the 460 builds more torque. Whether or not is is worth the extra bucks is your decision. There are stroker kits available in many sizes for the 429 / 460 engines, so you can actually go as large on cubes as your pocket book can afford. JMO