im going to assume a G3 teg.
1. yes it will fit the engine, all bseries trannys r interchangable
2. it will NOT fit the chasis, the G3 chasis is equiped with Hydro tranny stuff (cylinders ect). so u can put it in...but it wont work.
3. if its going into a G2 or any other car with cable tranny stuff, everything is fine