'66 Barracuda front end rebuild
If you have a rusty, stuck adjuster bolt, you have a few options.
As previously mentioned, try and keep soaking it with the rust penetrant of your choice.
Then some heavy duty tools.
A 3/4 drive ratchet, or breaker bar, a good impact wrench, or the flame wrench.
Me, I've been pretty happy with Kroil, or Justice Brothers JB-80, on suspension parts at the wrecking yards.
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Sometimes you just have to get out the heavy artillery!