Now I don't know what to think

hehehe.... Well I checked this morning before I went off to co-op and I have 6 bolts on my valve cover. I will check the engine code tonight when I go home because I am at school right now

Where would I find the engine part number so maybe that'll give me a better idea because I am not sure at all now. None the less, kinda got away from my first question about the RPM Tachometer, anyone find out any other information about that?
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1969 Mach 1, 351 Cleveland, 4 Speed. going threw a mild restoration.
Moving At The Speed Of Sound.