It seems that you are
We can't both be King of this land,
I wondered about K-NOT or something to do with "TIE-LAND", but unsurprisingly OP confirms that neither is what they had in mind. Perhaps, in view of the latest hint in comments, this is about a game or sport; if the game is tied then no one has won (hence "is King")? (Perhaps the game is chess, which has kings -- though the usual word there is "draw" rather than "tie".)
even if you have four in hand.
One kind of tie knot is called a "four-in-hand".
Around your throat,
This is where ties are generally placed.
find my ways of deceit,
(not sure what's going on here, though "decEIT" ends with TIE backwards)
forever connected, don't miss a beat.
Connected, that is, by a musical TIE. (Thanks to @Hellion for suggesting this in comments.)
Let's meet under the 203,
No idea, except that it seems some cable TIEs are 203mm long for some reason. (4/5 of an inch, I guess.) Oh, and the Unicode symbol for one kind of tie (used e.g. in ancient Greek to indicate that a group of letters forms one word rather than two, and in IPA to indicate the absence of a break) which it calls UNDERTIE) is 0x203F; this features both "under" and "203" but that trailing F is important :-).
twin engines will make short work for me.
TIE fighters in Star Wars are so called because of their Twin Ion Engines.
During my atrocities,
you will twist with defeat,
Apparently (thanks to Rubio in comments) a reference to twist TIEs, though I don't understand what defeat has to do with this.
to end the tide, would be quite a feat.
OP's latest hint in comments suggests that the "end" is the last two letters DE, with TI left over. I confess I don't see how to get TIE out of this, though; it seems like it would need E to mean "feat" or something.
... Oh, I forgot to say anything about the title.
I'm not sure about the "spike", but a sleeper is the same thing as a railway TIE.