The big risks with overheating a car is warping the cylinder head or block and/or causing cracks in either. Which can lead to all sorts of leaks (coolant in oil or vice versa). Sometimes you can get away with it and other times you won't. Can be very costly.
Sounds like you blowed her up. That or melted some wiring. You need to diagnose the problem. My guess would be you cooked the cylinders and have low compression, blew a had gasket, or cracked the cylinder head.
I'd check the oil first -- it could be burnt and thick and gooey --- and OIL is your number one protection. I'd also look for water in it (looks like a thick milkshake... check the oil cap etc and or dipstick for signs of this).
Fire it up and see if it still sounds bad - I'm thinking it was just HOT HOT HOT...
Get the oil changed - fix the radiator and fan - and see how she is... With that many miles on it - it's got to be loose... so maybe it'll be fine.
try chasing the distributor cap/wires to make sure they are all in one piece and working, then check the plugs. if those are fine it may be what was mentioned earlier, a blown head gasket and/or crack. No leaking though? hmm. did you check all the fluids for signs of discoloration/coolant in oil, etc?
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
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