Thanks Joe,
All I can tell you is that the radiator shop said it couldn't be repaired, and would leak again if I use it. They want to install a new core.
It was in the car when I got it, but the outlet hose was plugged. I bought a shutoff valve, connected it and it did produce heat, but the fan was rattling, so I decided to take it out, correct the rattle and paint the housing, clean it up, etc. And it does show signs of past leakage. The previous owner had the car for some long time and the heater sat with coolant in it but was never circulating. I drained it and the coolant was a little dark.
I haven't tried anything in the way of cleaning it or checking the circulation, given it shows signs of corrosion on the core and some rust on the inside of the housing where it has leaked in the past. Wonder if it's worth a shot to try and clean it up and check the flow?
As for the bent tube it will go back together the way it is, but the inlet and outlet don't fit the openings in the housing or the firewall properly. And I've tried to straighten it, but not aggressively, afraid I would make it worse.