I was looking for a spare head for my 1993 saab classic 900 B202 engine. found multiple heads 1988 and 1989 available from B201 engine. Thought I could easily interchange, but you guys said I need also change the intake (no big deal) and it would work. Naturally, I do not know whether to use...

I probably need a replacement head for my 1993 Saab 900 classic 2.1L I believe that a replacement must be 91 or newer. I believe pre 1991 is different and not compatible. Can someone add to this thread if they know. Knowing will help me shop the parts market. Thanks in advance.