There was a thread on For B Bodies Only that the owner of the 70 Hemi Charger R/T pulling the engine and sending it out to be rebuilt again. I don't remember the exact details, but I don't think that the engine had more than 500 miles on it.

70 Charger R/T SE 472 Hemi 70 Charger R/T convertible 70 Charger R/T V Code Sixpack 69 Charger R/T SE Sunroofcar 68 Charger 383 68 Charger 318 71 Charger R/T 70 Challenger convertible 71 Challenger convertible 71 Cuda 340 09 Challenger R/T Classic