I was in Ca. in the mid 70's to 94 and parted/scrapped a lot of 340 Darts, dusters, demons etc. because they had, OMG rust bubbles in the lower rear 1/4's. most were bought for 50 -100.00 some even ran

Then there were the 68 -9 Chargers that r-ped and pillaged for my 68 RT that I restored for a daily driver. they were also somewhat plentiful at the local pick and pull yards. I do have to check the numbers on the 340 in my 38. I pulled it from a 72 4spd cuda and sold the rest to a buddy who put it together for his son to drive. Think I paid 750 for it and drove it home