Paul,
You are making me want to spend the money on the front suspension.. I suspect I will be around 3,350lbs with me in the truck after the powerglide swap, backhalf/4-link, loss of my 125lb tailgate, and the addition of the cage. I know my 51/49 weight balance I had at 3,650lbs will be long gone.
But if I could get to 3,150lbs, I might be getting closer to the 9.9x NA goal I have set for 3 years