Lynn,
I have bought and sold a couple engines into and from the us and simply declared them as goods of a private exchange sold on a "Bill of Sale" and described as engine parts specific to the year and model of the car (i.e. 1955 Chevrolet engine parts). Because these are antique auto parts over 50 years old, the EPA thing never came up nor would I want to have those involved.
You can contact Yellow Freight for a shipping rate from Ontario, and can request them to include a broker handle the paperwork which should be reasonable based off the value of the deal. Just tell them they are 57 Chevrolet assorted engine parts and an intake for your 57 Chevy and list the parts with an original origin of the good old USA and it should be clear and simple.
And there's no duty or anything at the moment. Unless Trump starts a tarriff war? The broker will then cover the amount of the sale under a customs bond which is what CBP requires for the paperwork that accompanies the order crossing through the border.
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I like solid lifter cars, big cams and cars w/ 3 pedals in them. 
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