Hi My name Is sean / Conkidz

I recently bought a 1992 mpv with oil in the cooling system ive been told that this means my motor has a blown head gasket so therfore I would like to change the motorif in deed this is the problem !
however if this is not the case then please some one help me im a the end of my witts. If I need tochange my motor then what other motors will fit in the engine compartment as i Have found no 3.0 v6 motors that are in my price range and if a gm,ford, or any other will fit the info would help it is rear drive only so hope fullyI have