How much do you think a 72 coronet with a 318 could tow?

When my older brother sold my dad's 68 Coronet 440 cop car, he sold it to a friend that had a 70 GTX drag car. Used it to tow the GTX to various drag strips in the mid-west.
Never a problem. Of course, a 440 with engine oil, tranny and power steering coolers took a lot of worry out of it.