Spare Parts Question

Hi all, I'm new to the site today and I have a question.

A buddy of mine got a running '70 Ford Torino for $250. We tore the car down today to start a resto on it. only small surface rust, glass is perfect, frame is true engine runs interior needs some work, but for whatever reason we decided to tear out the motor. The Original was a 6cyl, but the orig owner replaced it with a 351C sometime in 75, but sometime after blew it up i believe taking one of the quarters with it. Anyway we tore down the '78 351W, that's in it now and he gave me the Stock Valve covers, the stock exhaust manifolds and the stock water pump From the 351W. I tried to get the orig 2 barrel manifold but he already had that sold. I planned on steam cleaning priming, and repainting the covers and the pump, and reselling them on ebay. does anyone know a good price to set for either of them, or know someone that needs them. I would be happy to send them off when I get them finished.

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Also. the oil cap on the cover was broken. will any general cap replace it or does it have to be that motor specific

I wouldn't give a nickel for a used stock water pump. The valve covers might be worth $10. They are common as dirt.
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How about the cap. should any ol twist on cap fir, or should I search the yards for a late 70's one

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lso the manifolds. I saw a set of stock manifolds on ebay for about $30. I plan on cleaning them and removing the rust. they're not corroded at all and the threads on the retainer bolts are still shiny