I have a SM420 (2wd model) out of a 68 Chevy 3/4 ton truck. Early production just before the 307 and SM465's came out. Complete tranny with GM bellhousing. No knob on the shifter handle tho. $200 plus shipping UPS ground.
I also have a Smitty Built front bumper that came off a 83 Yota, Dunno if the mounts will fit your 85 or not. U might have to build a new set of mounts. Needs sandblasting and paint or powdercoating. $100 plus shipping UPS ground.
JR