Do a compression test. Check oil and coolant for cross contamination. If either is leaking a significant volume externally locate the leak. I wouldn't spend a cent on parts until some basic diagnostics are performed.
Please elaborate what you mean in stating the the spark plugs were "fried". Damaged from detonation? Ceramic insulation shattered? How did the #1 spark plug just "pop off"? Is this a 7M, 1G, 1JZ? GE or GTE?
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