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Well, the answe, as usual, is "it depends".
The blocks are pretty much interchangeable. The heads, well, not so much.
K-Jet heads ('76-'81 and most '82) have holes for injectors. LH-Jet heads (a few '82, and '83+ non-turbo) do not. The injectors mount into the manifolds.
If it's just the block that's shot, or if the head is rebuildable, you could use any block with the current head. But you probably want to stay away from the '85- mid-'88 B230 blocks, they have smaller bearings.
Now, if you really want to go fast, what you want is a Canadian-spec B23E. I have one for sale, but I'm in Michigan.
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