Any time a problem persists even after attempts to correct it,it's time to drop back on basic engine diagnostics.
Compression test,leak-down test,vacuum gauge readings,that sorta stuff.
Along with close inspections of stuff like the valvetrain and valvesprings and such.
At the very minimum you would be establishing a "baseline" for this combo,that way you can always track the engines "health" based on how it was when it was "fresh".
And you may just find something that needs attention before it gets really nasty.
Timing & ignition really should'nt be all that complicated,mostly nail down the basic set-up and forget it for the most part.
Also agree that degreeing the cam should not have been considered "optional".
And you can throw rocker arm geometry and pushrod length into that "mandatory" catagory as well.
BP.
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