Flying SparkPlug Wire/Loud Engine, Sparkplug wire laying on engine Options

[celicazero]

First and for most... great forum!
Its the reason I decided not to sell my celica.

I ran my celica pretty one night after having it transported to southern cali from Chicago. It idled funny (around 2200K). It clunked off harshly when I pulled into my drive way and shut it off. I have never had any trouble what so ever form my car. I openned the hood to find the 3rd plug wire (from right to left) sitting lose on top of engine. It apparently hit the hood hard enough to tear the cloth underneath.
Plus after I reseated it the engine sounds really terrible. Very loud tapping and clanking in all gears and even during idle.

[celicazero]

After finishing the retapping of the spark housing and after days of ripping up the block. The plug fits better than before and in my opinion. I inserted it and removed several times. kinda got me worked up. Now after reassembling everything I still had that horrible noise with the engine running. very loud ticking more like knocking. I took it to a local toyota dealer and they look at for about two hours (after three hours of waiting). They then gave me a bill for looking at it and an estimate on a replacement 5sfe for $5700 . Im not sure but I think they even want another $1200 for labor. Is this sane? Any ideas from here? I have never seem any trouble until now and the car has been well maintained. i only used mobil1 plus the longest I have ever went without an oil change was 3400 miles three years ago.