I would take $100 of your hard earned money and find a real good mechanic that knows what 140s are all about and have him inspect it. With a list in hand, you will know exactly what to fix, and what suspension upgrades you may be in for.
Ditto, brakes and suspension before going faster. The buzzing at 60mph is normal? Those old 4 cylinders did make a lot of racket. Perhaps a valve adjustment? A good inspection will reveal all :)
Klaus
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1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi
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