Frozen Manifold Heat Control Valve

I've read about cold running issues on \6s that had aftermarket exhaust manifolds with no ability to heat the intake manifold with the exhaust.

My manifold heat control valve is frozen in the position shown in the pic below. I've soaked it in penetration oil for a couple weeks with no change. What's a rookie to do? Soak the whole thing in vinegar and check it once a day until it's free? Smack it with a BFH to knock it out? Let it ride where it is?

Fish or cut bate - fish or cut bate - fish or cut bate.:realcrazy:

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Depending upon the weather where you drive, a working exhaust heat stove can help drivability. Problem is service kits for the slant six exhaust heat stove are no longer available. I would try a really good penetrating oil like Kroil before I dismounted the manifold to soak it in vinegar or Evaporust. But to get it free and working I bet that is where you end up.