I have a stock 1974 Dart 318 LA engine with around 76,000 miles on it and it is a donor engine for my sons 1970 Dart. I did a compression test and came up with these results: #1 = 105 #2 = 120 #3 = 0 #4 = 120 #5 = 110 #6 = 75 #7 = 110 #8 = 105 Surprisingly the engine does run.....not well but it runs. I did the test with the throttle closed. The donor car did sit for some time before I got it. My question is: How can I tell if I have a head/valve problem or if the engine is tired and has some piston ring issues? I'm sort of hoping that its a head/valve issue at this point. Thank you for your help!