GIT IT NOW!!!!!!!!
If you wait, it'll be gone and you'll just have one of those, "I almost had a cool car...." story to tell everyone next year.
What condition is it in? Like the others have said, if it's #s matching, keeep the 383, or do what ever you want and keep the 383 in the corner of the garage.
'69 Super Bees don't grow on trees. Get it before it's a memory. So what if you have to spend a little bit now to get it. When it's gone you'll wish you could've paid twice the difference in price from that $10k.