Http://www.nadaguides.com/
Go here, put in the information, subtract how much money they will have to put into it, then of course, subtract money for time and work. Come to a reasonable conclusion from here. Always try and sell for more than what you want of course and try to negotiate. Craigslist.com is a great place to try and locally sell your car.
Best of luck.
EDIT: Check different automotive and classic car websites (Google search) to find reasonably cheap prices for parts. Useful for recommending to buyer
Go here, put in the information, subtract how much money they will have to put into it, then of course, subtract money for time and work. Come to a reasonable conclusion from here. Always try and sell for more than what you want of course and try to negotiate. Craigslist.com is a great place to try and locally sell your car.
Best of luck.
EDIT: Check different automotive and classic car websites (Google search) to find reasonably cheap prices for parts. Useful for recommending to buyer