I installed new plugs, cap ,rotor,wires, and coil.Motor still misses. Scanner say no Misfires and the injectors all check out with the scanner. The 360 just runs shi-y and shakesfrom idle to just under 2 grand then smooths outand seems to run fine. Sometime it is worse than others. I would really be thankful to get some feedback on this problem.

 

Might want to check the compression,I've seen my share of burned valves at work.Hope this helps.

 

Cracked head? I've heard these heads are prone to cracking and will cause a missfire thats hard to track down. You didn't by any chance use the Autolite plugs did you? When I used them I had a slight missfire that I couldn't figure out so I decided to switch back to Champions and it cured it all up.