According to the manual for my car, a 1991 turbo 740 (battery on the driver's side), the ratings are "520A/100 min." I guess that means 520 amps CCA, and 100 min reserve capacity. The manual does not give group size. Note, though, that the 1991 and 1992 740s were nearly 900 series cars in many ways, including computers and electronics/electrical system. The battery might be different. Yours is a "pure" 700 series car. Bottom line, though, is if it physically fits, or can be made to, and provides enough starting power and reserve capacity, it will work.
For what it may be worth, my battery is an Optima, group 75/25, which does not even come close to a perfect physical fit. But, with the application of a little of our legendary Brickdriver ingenuity, the hold downs can be made to work. My battery's ratings are 720CCA and 90 min reserve capacity.
If it is an option for you, I heartily recommend the Optima batteries. Mine is 9 years old, and may, finally, be showing signs of beginning to go down hill. Note that I said "may" be showing signs aging. Here, in Florida, batteries usually last about 3 years. Mine still holds 12.5 to 12.6V (should be 12.8 or more) and starts the car just fine. The alternator failed last week, and the battery still had enough strength to operate the car for, possibly a few days (there were subtle signs of alternator failure a day or so before it became obvious), and then, after the car died and was towed home, giving the nine-year-old battery time to rest, it started the car and ran it long enough for me to turn the car around in the driveway. Also, note that any AGM battery, like an Optima, won't cause corrosion on the terminals, because there is no leakage of electrolyte. They are fully sealed.
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Scott Cook - 1991 745T, 1986 Toyota Tercel (Don't laugh, it is reliable, faithful AND gets 41 mpg!)
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