I'm sorry it took so long for me to see this message. It has been a couple years since I did the body lift. I don't remember how much thread I had leftover with 1 1/4" blocks.
There is something like 2" of space between the welded nut and the body of the bed, so I think that you will be fine with 150mm if that is what you choose.
I realize that you may have already done the body lift.
Thanks,
J.