Check out the thread in the link below.
@V8-valiant is doing a Gen 3 swap in a Valiant, which would be the same as your Barracuda. Maybe he can offer some advice since he has the mounting already figured out. Welcome to FABO!
[URL]https://www.forabodiesonly.com/mopar/threads/392-8hp70-65-valiant.553006/[/URL]