Take pictures of the damage to identify all the parts you will need. An impact like that could have damaged more than just a caliper.
Hendrick Auto Parts in Apex NC has been supporting my habit for some time. They just ordered a 91/92 battery box cheaper for me cheaper than any place online.Add Megazip to this list of new genuine Toyota parts sources. Dealerships are probably not a great help as 80's are too old for most to be interested in genuinely supporting.