Isolating engine noises

[withamc]

Can someone tell me how to tell the difference between the difference between lifter knocking, rod knockong, wrist pin knocking, etc?
Also, I'll be changing my cam out in the next week or so. Should I be soaking the lifters in oil while I've got them out? How do I tell if I've got a bad lifter? Is there any harm in swapping two from my noisy #4 cylinder to another to see if the noise follows?

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86 GT, GT40P heads, Cobra cam, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s.
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Crane 2031 on order