Raise rear end with extra leafs??

I actually did this on my 66 by using the original main leaf, and the other leafs I got from a used set of springs from a 340 Duster. It yielded one extra leaf on each side, and I was able to use my main leaf as I was under the assumption that the Duster leaf's were an inch or so longer and may not fit under an early A. This was some time ago, and having never driven the car before this swap, I can't attest to the ride difference, I just know it sits right and feels good!! Geof