340 block value?

Ok, so there is a71' 340 block that has been bored .040 and honed. It also comes withnew freeze plugs and Ross forged pistons. The guy is asking 900 bucks for both. What do you guys think these are worth? iS 900 a good deal? what do you think I should offer him? Thanks. Oh, and what should I pay for used 14 in rally rims with like new tires?