Now is NOT the time to replace the chain, since you don't have any references to roll a new chain in. Do tha once you're reassembled and there is evident chain stretch.
Nothing wrong with getting practice on a parts car. You can always transplant the "almost good as new" motor into your next car if this one is retired.
The exhaust nuts are available from any competent foreign autoparts store. They are also used in VWs & BMWs. The short exhaust studs are common, and will cost about 1.50$ each. The long studs are NOT common. More than likely you can get them from fastlane. If you're lucky, the driver's side manifold of your 4.5 doesn't have them. A 3.5 has two.
Most definitely do not over tighten them. And again, make sure each one gets a washer.
-CTH
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