Leaking Coolant

Hey guys, just got my 1971 Dart Swinger 225 /6 tonight. Started it after it was off the trailer to drive it to my driveway and the engine overheated. Let the car cool down, brought it to my garage and put some more coolant into it. This is when I noticed a leak, which looks like a hole in the block. ive got a picture to show the spot. Anybody else have this happen to them? Any suggestions as to solutions? I am very new here so any input is greatly appreciated! Thanks