340 question
I paid $300 for a complete stock standard bore 1970 340 in 2002.
$400-500 for a rebuildable short block is fair or $800-$1000 for a good x headed long block at standard bore.
My favorites are the 70-73 blocks with the extra ribbing down the center of the freeze plugs, but really I'd take any of them.
I have 3 of'em myself.