Thats a tough question. I had to cut the rear engine bay of my ghia. My opinion is if you dont want to cut sheetmetal of your vw then an engine conversion isnt for you. Somewhere your gonna have to sut some sheetmetal.
Oh well From what ive seen its actually shorter than a vw engine. And when I say shorter than a vw engine I mean a vw engine with full cooling tin. Im not sure if the vw engine in your car has the same cooling tin as a beetle or ghia. Anyway here is my cardomain site and on the second page it has some pics of a bare block in my ghia., It might give you some clue about how tall the 2.3 is. http://www.cardomain.com/memberpage/376326/2