Totally ready to go and bolt on, I think $800 is fair as well. Very few are offered that way for sale. Bubba could help give some prices on what it takes to get a typical core up to snuff.
A built Harmon Collins to include bendix aircraft points and two bosch coils runs approx $400-450 from us. If it needs a new rotor and side plate could be another $400- to 450 added to the cost....... Buyer beware a used core from a shelf is approx $ 200-250 in my world....
And put me in you auction for $150 for the harmon and collins and $150 for the kr wilson tester just to get the auction going......:>)