Just changed plugs, rotor, distributor cap. Engine has moderate spark
knock/detonation  when under load like climbing a hill, accelerating
hard (if there is such a thing in a Vanagon). Timing issues I'm sure,
but if any one has any tips about how best to tackle this
detonation-under-load issue, or tips and tricks on setting the timing, I
would appreciate hearing from you.

Thanks,

John Rodgers
88 GL Driver