Stuck valve?--340 V8---Compression check RESULTS

You are a long ways away from deciding if the engine needs to be rebuilt. You have to do the leak down test to know where the compression readings are low from the cam you are using or low from the engine being worn.

It's been mentioned three times now and this is the forth the ignition wires do not look good in the picture and can easily cause the problems you have. Is see some grey discoloration on the boots that could be an indication of leakage and arcing.

Also, now that you are mentioning you just replaced the cap and rotor. Is it seated right? Did you get the rotor down on to the shaft all the way? if you didn't you may have torn up the spring tab that contacts the center of the cap. Are there any signs of tracking on the inside of the cap?

What do the plugs look like?\

Any possibility you put some bad gas in it?