Lug nuts frozen – HELP!

I'm having a hell of a time getting my lugnuts off on my 66 300. I moved to Mississippi recently so I think rust may be the issue. I've used my 1/2" impact with 1000lb/ft of torque but no luck. I've also tried jumping on a breaker bar to "shock" the rust loose. Still lo luck. Any suggestions? Should I apply heat at this point? Any help would be greatly appreciated.

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