I went very un-scientific on my spring selection. In fact, I don't remember what springs I stuck in there. I had a large assortment of springs from 200X, 350X, and 250R (83/84). I don't actually remember what I stuck in the tubes, but I had to make a short spacer of PVC, so I'm pretty sure it wasn't the 350X springs... now that I think about it more, I'm pretty sure it was the 83/84 250R springs.
My plan was to measure the spring rates of the stuff I had using a poor-mans spring rate rig: piece of plumbing pipe held vertically to keep the spring straight, with dumbell weights stacked on top spring, and then measure the deflection. Spring rate = force/deflection. I may have jotted notes but I can't remember what I found out.
So, as for my springs, I'm running something that fit of unknown rate... yea, very scientific!
As for myself, I'm about 205-210 (depending on how big of a lie I want to tell).
Now that we're diving back into this topic, I'll have to either locate my notes on the spring rates, or just go and re-measure the different springs I had (just for information).