Here are the results after we cleaned the tune up :
Results from our custom tune is on the right side, the end results of 2 other tuners who had hands on with the car on the left side.
Owner simply did a Scanner recorded testrun and sent us that recording and the PCM to us since he was not local to us and in the end with proper methods of analyzing scanner data we custom tuned the PCM off board.

Some of the changes :
Before - WOT timing 23 deg, Torque 353 ft/lbs, HP 353

With our tune : WOT timing 27 degrees, Torque 380 ft/lbs, HP 430 and 100 degrees less timing loss due to ping.

One problem that has to be resulted, in proper analyzing the scanner data we see the left head at times is 7% leaner then the right head. This is causing the ping.
Suspect is due to the lousy design of LG headers and using rear O2 into the front locations is their special air channel wires are too long so excess wire is bundled up which crimps off the requires air source O2s need and also possible they used the wrong exhaust manifold gaskets causing slight leaks.

Also as we assumed when owner ditched the ported throttlebody and installed a stock one the throttle response time that was slow is now working correctly.