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"...does in intake manifold have to come out or can I unbolt it and pull it aside?"
Pull it aside.
"What years of heads will fit, just the B21F heads up to 1982?"
Hmmm. I think a head from '76 to '82 will fit. In '85 the non-turbo 240 switched to the B230F engine, and I think installing that head requires modifications (and buys you nothing in performance or reliability). The boneyards should be FULL of B21/23 heads.
The '81 and '82 years were very common. You should have no trouble finding a cylinder head. Hell, I have two '82 heads kicking around here (one has 347k miles on it...).
"Will the turbo head fit?"
I think so.
But rather than take chances with a turbo head or a B230 head, simply find one from an '82 B21F with your fuel injection (I'm assuming it's the K-jet system). A few '82 cars had the rare, early LH-jet system, version 1.0, with the electronic injectors. This head is similar to the '83 and '84 head.
"Will the seat or valve wear and produce a better fit? I don't have an experiance with burnt valves."
Don't quite understand your question. "Valve wear" and "better fit" don't compute for me.
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