Alum. Big Block 0-326711 4 bolt VALUE ??

It's listed the first motor on mortec.com as a can am motor and the block is good shape other than 2 heli-coiled holes and needs all new sleeves . I know where this block is and he wants a healthy price , but not sure if it's real healthy and maybe I could make some money . I'm really not sure what it would be used in either ....my buddy said the last time he saw one sell about 3 years ago did $7500 . One guy said it was in the factory race cars and there only about 30 somethin made ??? Thanks , Richard