WIW '72 340 'CUDA

mopardug said

I've been talking to the PO, and she believes that it's originally out of Frankfort, Kentucky, and that she was the second owner.
I'm going to pop the plugs this weekend and see if she'll turn over. What does everybody suggest to put in the cylinders before I try to turn her over?

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If it's locked, you're probably not going to have much luck on the same day. You may need to soak it and come back in a few days after it's had time to soak in... or even repeated applications over the course of a couple weeks depending how bad it is.
There's lots of "favorite" brews for soaking the cylinders- Kroil/PB Blaster, Marvel Mystery oil, kerosene/ATF mix, etc. The common denominator is that they need time. And when you try, work it back and forth with a breaker bar, gradually increasing the distance you wiggle it. And don't force it too hard CCW, you'll just loosen the crank bolt.