Can u put a 7.3 turbocharged diesel into a 1985 f250 and '85 f350 plus a 6sp tranny? What would i have to do?

You can but it wouldnt be easy. You would likely need a complete donor truck to make sure you have all the wiring and sensors. Youd be much better off doing a 12v Cummins swap as all the parts for that conversion are redily available and the cummins only needs 3 wires to run.

yesyou can . is it idi or powerstroke?

my brother put a 2001 powerstroke out of a wrecked cab /chassis into an 85 dually that had a 460 in i think...gasser v8 anyways..fer real it was in a mag after the conv ..was a hell of a project...

he has done it if ya really wanna know the scoop lemme know. the ecm part was the worst..he had a custom one built