Another episode of " Name This Part "

Top plates are 4 bolt Hooker header flanges to weld the tubes onto when making headers. You need the adapters for Hooker headers to use them . Once the headers are made you cut them apart

The bottom plates are W2 Hedman header adapters plates that bolt on the head and then your headers bolt to them.

I would be interested in them if the price is right to make patterns out of stainless

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Believe this correct, as years back, had both Hooker & Hedman W-2 headers.

#2 may be a Hamburger torrington cam plate for a small block, and the aluminum spacer may be the spacer used for cam bolt and cupped washer without fuel pump eccentric.