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Re: oil and instant fouling
Valves don't "rattle in the guides", at least not so as can be heard. The sound you're hearing may or may not be related to oil fouling plugs. Oil intrusion into the combustion chamber can dilute the fuel/air mixture and lower the octane.. This can cause detonation that makes a sound like shaking a can of marbles. Another source of detonation is excessive base timing setting.
How much oil does the engine actually consume at, say, 1,000 miles?? Any more than a quart in 800 miles will be considered excessive by most opinions. Worn rings can also be the source of your oil fouling and consumption.. As others have stated, the cheapest and easiest approach would be to replace valve stem seals.. If that doesn't help the situation, it's time for a rebuild.
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