Toyota Repair: Bad knock in engine, piston slap, rod bearings

Question
I have a 1984 Toyota pickup with a 22re engine. It started to develope a knock that got bad enough that I parked it and started looking for the cause. I replaced the timing set and 2 out of 4 rod bearings. Put it back together, started it up and still had the knock. I tore it back down thinking I might not have installed the timing set correctly, checked everything according to my manuel and put it back together and still had the knock. One thing I did find is if I pull the outer hose off the vaccum advance at the ditributer the knock almost goes away. When I take it to about 2100 rpm's it sounds like it's going to fly apart. I've tried setting the distributer a tooth forward and backward but no resaults. I'm out of ideas. Can you help? Thank You. Dan

Answer
you didnt give me mileage.
You could have a main bearings on its way out, Could be piston slap or even a s simple as a chunk of carbon on the piston.
try to isolate to head or lower end.
Try and isolate to 1 cyl. Pull plug wires
Tough to diagnose a noise thru email

Mike