car-part would be where I'd start.
hmotorsonline also has JDM K24's listed for $900. would be a great start to a frankenmotor if your K20 head is still good.
In reply to spacecadet :
How plug and play is the frankenmotor swap with JDM engines? I know older Hondas required some fiddling with different connectors and whatnot.
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