From sitting in storage 2-3 years, front suspension toe/camber issues required parts replacement. Got parts easily online and found Peugeot mechanic in LA competent to complete the job.
An excellent well-executed touring sedan. Spacious and extremely comfortable for front and rear passengers. A cavernous trunk! V-6 very tight & torquey, but slow. Gas mileage 12-14 city and not much better on highways.
Above all it's Pinifarina's minimalist modern design that looks better today than in 1978!
Your 604 Peugeot has GM-made 3speed automatic transmission, so it is certain that her torque and fair engine power are largely spoiled by slip of automatic.