Thanks for all the input.
Up till now there was nobody who told me that this will not work.
So I'm thinking just to go for it.
First by building a mock up to be sure that everything is there and fits.
One challange could be to get the pittman arm solved. A Chevy 3600 has a very long pittman arm.
And I'm not in favor of heating up or welding a pittman arm.
I would think you would be OK to straighten or weld and then have a machine shop heat treat, shot peen, stress relieve the part afterwards. Or whatever is appropriate. I am no machinist, but one will know what to do. The other option would be to have one made to spec. Here in the States, I know that custom pitmans are offered for lifted 4x4's and some I'm pretty sure are made from thick flat stock instead of castings. Any competent machinist could make what is needed. Cheap? Nope.
Larry W.