392 in a 70 Duster

"If" , I were going to the trouble of installing a new hemi in anything , it would dam sure be the biggest one I could get !
Why go to all that trouble for a wheezer ?!
And that mentality is exactly what is driving my budget into a downward trajectory.

I to subscribe to the theory of doing it once. And I have reservations that I will go to the trouble of putting the 5.7 in the car, only to have regrets and wish that I had put a 392 instead.

So I have to ask, since I have a similar a body, how does the 6.4 run in that car?