340 harmonic balancer question

casting number on balancer 3614369 , is this for a 340 or 440 ? All I can find says small block , and the 440 engine that was with my duster , not in car and the balancer is not installed on engine but is the one that was sent with engine ,,also is there any way to determine if a 440 has a steel or forged crank by casting numbers somewhere on block ?