Head gasket follow up

[JtownJoe]

Finally got the head off my 30' Tudor today & there was plenty of evidence of coolant in # 3 cylinder & an area of the gasket appeared damaged between the cylinder & water jacket area near the exhaust valve on #3. I will still examine the port & valve area closely but if all is well there that should solve the blown gasket issue. But another puzzling discovery is that #4 piston has almost no carbon build up as compared to the other ones. (Looks almost new) for a 4 year old rebuild, I have always noticed that there seemed to be little, if any, difference when I pulled that plug wire when running, but all others would slow down the idle. This seems to bear out my suspicion that #4 was firing weakly if at all. I had same 100# compression in that cylinder and of course switched plus & even p[lug wires in the past with no changes noticed. With the head off I verified that the valves are opening & closing correctly & I know it had great spark, any other ideas??