The seller says that Jerry calls this car “The Ultimate SM” as it has the following features: extremely rare resin wheels that were used on the rally cars (these wheels alone have sold for up to $12000), engine upgraded to 220 HP (40 HP ….. As for SM maintenance, the SM yahoo group has several guys in it who've mostly solved all the SM “fatal flaws” that were left in the design from the factory – a reworked GM odd fire dizzy developed by John Titus – stronger, longer … …

Read more here:
BaT Exclusive: Hathaway Restored 1973 Citroen SM For Sale