73 340 motor worth

my neighbor came over and was talking mopar. he has a 73 340 rebuilt no miles, says it has .30 over cast pistons, w/stock rods and crank all checked, has j heads.

ok, what i had asked if it was balanced and he says no all it needs is a fluid damper. now will sum new pistons throw off the balance or will this thing be ready to go.

oh ya he wants 1000 bucks, he says he just wants it to go to a good home and couldnt help to notice all my mopars.
seems like a good price, what do you think.