It sounds like you were given the straight scoop. Lock washers aren't used on the exhaust manifolds, but you do use flat washers. The only other thing I might suggest is to use red RTV instead of the graphite compound. Minor irregularities on the mating surfaces which may result in leaks, are more readily sealed with the Red RTV.
If you don't care about authenticity, you could use gaskets. (shudder)
You're right about these cars being an onging project. It kind of makes one appreciate the reliability of contemporary cars. (I can't believe I said that!)
Tom
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