There are several options available for this installation. This is a link to my 6.1 install in a 1969 Barracuda.
If any questions, just PM me.

https://www.forabodiesonly.com/mopar/threads/srt8cuda-build.218445/

Jim

1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL