Turbo six cylinder in a Satellite

I would skip the 518 and go straight to the 61 w/307!
I have owned one GV in my 91 Dodge diesel. no problems, worked great.
The price is what makes it so hard to go that way. And you just can't find a good one used!!!!
I didn't change valve spring when i put the 3800 governor spring in. but it did have heavier exhaust spring because it had and exhaust brake!