Removed top end, what should I check for?
I pulled the distributor, alternator, intake, water pump, timing cover, headers and heads off the car. For those that don't know, I was having missing issues around 3500 rpm. The most noticeable symptom was the exhaust cackling once the rpm was reached, and then when manually shifted the noise goes away until the rpm was reached again. With the noise, I noticed carboned and oily plugs, and I noticed a fallback in power with the noise. In addition I had (a couple times) seen a gray haze out of the exhaust after accelerating hard or revving.I checked for external vacuum leaks, reset the valve adjusmtent, reset the timing, installed a new pickup coil in the distributor, tested the the distributor components, checked for spark, installed new wires, installed new plugs, checked fuel pressure out of the pump, and pulled the fuel filter in the inlet to check for a restriction. None of the above helped.
Now that I have the top end off, what can I check?