Ok - so would a 2.3 Head from a 2000 9-5 HEAD PART # B235EEA002045161 fit a c900 2.1/2.0 Block? If yes - any sort of "mods" needed as rummored, and how hard is it? I have a chance to get one CHEAP and it's only got about 20,000 miles on it and have about 6 hours to decide. Yes, No? (Rhich? Advice) Thanks in advance!