CR31 carb bank prices??

I have the opportunity to buy a set of CR31 carbs for $400 for my 81 CB750 DOHC. Most likely I will need to change the jet sizes and tune them for my bike because they were used for a different application. Is this a good deal? Great deal? I'm hesitating because I've only been shopping for carbs for a short time and don't know if I am better off looking for longer. thanks.

it is a good deal ? that is an absolute steeel,buy them and just resell them
they are too much for a 750 but with tripling your money or more you can buy something more well suited

CR31s are the appropriate size for my bike. New ones sell for about $750. Im not looking to make money on them....just want a good set for my bike

Buy them, sell them and buy the CR29's you need for that bike.