Parkerizing is the way to go. It replaces a few molecular layers of iron and replaces them with a porous phosphate layer. Douse the part in light oil and the oil then protects the metal. Will not affect clearances- I've done old guns with this process.
Periodically hit each piece with a rag damp with WD-40 and it will never rust.
And it's an easy process after prep- I use old stainless steel cookware and heat the liquid on my gas grill. Baby Doll is mystified why I am "cooking car parts".
Here's the hood latch on my 64 TBird that I Parkerized.
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