how to slightly lift '65 barracuda tail end

TrailBeast said
Get out of the car? :D
Sorry, I had to.

Outside of different springs a spacer between the springs and spring pads would probably be your best option.
Second would be 1" longer shackles.

I will do some more looking into the shackles. The ones I have found so far have been longer than I was hoping for.
Thank you for the response.