I don't recall anymore. It was a hot topic on moparts at the time. I'm pretty sure he was well over 39. IIRC, he died sometime late 2019 or early 2020?
https://www.forcbodiesonly.com/mopar-forum/threads/1970-plymouth-fury-hemi.59922/#post-945587
FWIW, in the picture above is a brake switch mounting bracket. Do NOT forget to snag that from the donor car. IIRC, it's attached to the steering column with four fairly unusual screws. If you use the 1970 and up unit, you don't need the bracket.
While it's neat to have the year specific...