I'm not 100% not knowing to much about Lagunas but I would say you are going to find a 2.0 16 valve F4R engine in a 53 Laguna which is just an over bored version of your 1.8 F4P engine.
Your engine number should be on the engine block to the right of the dipstick above the engine number is the engine type in the photo is a 2.0 Scenic engine F4R 740 denoting it's a 2.0 manual engine so your should read F4R ??? or F4P ??? for the 1.8 engine.