With the skirt wipe and the gunk in the head I would say this thing never had it's oil changed.
The lobes looked fine but the head had never been cleaned. The real killer is the wear on the bore. Need a new piston and hone. Hopefully not a bore.
S14 connections on the motor are the same. The harnesses are different. So a Kouki or Zenki motorset would work if you kept the Zenki engine harness and ecu(powerFC).
If everything else is the same you should be fine.
Damage was not from a tune.
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Comments should be taken as Opinions not as Statements of Fact
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