If you feel the need to keep it then get it and save it. I parted out a 73 Challenger a couple years ago and it had a complete 70 318 and 904 trans in it and I called a good friend ( God rest his soul) to see if he wanted it since I figured if anyone would save it, it would be him and he turned it down so I scrapped it. They have forged cranks. I think the thing about saving 318's is there are so many of them out there we all take it for granted and say "nah just scrap it"