unknown chrysler car $300... supposed to have a giant V8...

If it's an old Chrysler it should be a big-block car,possibly 383,400,440,depending on how old maybe a 413.
If you go to look at it there is a flat spot on the block by the alt. take something to scrape the crap off this where the numbers are for the cubic inches.
It's worth $300 for the engine and trans. even if the bodies junk.
Keep us posted.