I was thinking about the stresses on the rear swing arm, and where the lower mounts are, but with 1/4" plate for the base and a couple of small gussets the mounts should be fine. As far as bending the actual swing arm, i could cut up parts of the top and re enforce the swing arm, that and gusset it up.
I thought about the mono shock mod too, but I wanted to try something different and keep that cool look of the dual shocks with these older bikes. I will keep you all posted on what I find and end up doing about a stiffer spring rate and or shock replacement.
Thanks for some of the imput.