OK now I'm making myself very vulnerable here and its not comfortable.. I have in my shop a 70 Cougar it belongs to a friend he bought it from a party in Texas over 10 years ago. They were told it didn't run. It has been sitting since in his garage. No one has tried to start it, until now. I put in a good battery. it turned over after replacing the solenoid. I bought new plugs points cond. rotor cap wires oil filter. NOW comes the problem. The plugs I pulled out are Autolite 45 rest. The new ones are Autolite 24 Now a blind man can tell they aren't the same. The parts store says it calls for 24. Did some one change the heads ? the engine? Where do I look for ID numbers on block, heads?? I admit I never was and am not now a ford guy.