i.d. these pistons

[3ddart]

opened up the hemi i bought last week. wanted to know what was there. the bore measures 4.268 and the pistons are part#s 2531963 left and 2531966 right, both marked o/s. can any one i.d. these? they measure .530 above the deck, but look like 12.5 to1 pistons i have seen. i must admit i just started the learning curve on hemi's as i've always run 340s, but the hemi bug bit me. i want to put this motor in a 67 dart for street use. also, i may sell the 68 date coded cast iron heads that were on the motor the have been maged and pressured checked and are in great shape. what are they worth realistically? thanx 3ddart