Reply to "302 Diagnosis"

The reason that I removed the engine to begin with is it started running a bit sour and eventually began dying out. The timing chain was severely stretched and was replace as was the cam. All was dialed in correctly at replacement and still should be as it has only run at cam break in RPM and idle. The motor runs great in any rpm or load condition until warm. Wouldn't an out of sync cam display symptoms at any temp? The funny thing is the low compression throughout all of the cylinders. I changed the valve seals during the engine work but did not have any other work done as all looked good at the time (regrets, regrets!) Could it be that after 35 years, the valves when disturbed by disassembly lost their seal? Or could the head gaskets be leaking without coolant or oil loss?