Don't know this specific car well, but temps over 80 are normal in summer, but probably not over 100. You do need to adjust the mixture. On US cars it is done by connecting a dwell meter or multi meter with a duty cycle function to Pin 3 of the diagnostic socket and adjusting the mixture to fluctuate around 22 degrees dwell (on 8 cylinder scale) or 50% duty cycle.

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe