NV3500 in my 74 Duster?

Interesting trans mount.

Looks like no floor cutting. That's cool.
Was there banging of the tunnel?

Our P/T "likes" to be shifted between 3K and 3500.
I'll have to check the speed at that RPM.

Seems like a trans with a low first would like a higher rear.
Might try 2.94...