I found a couple of 8ba blocks and had them both thermo cleaned and checked for cracks. 1 has a crack from the valve to a cylinder which has been sleeved. Junk ? The other is okay but will probably need new valve seats and probably 2 sleeves because 2 cylinders have pitted. Should I fix this one, or look for a good one. Kinda getting tired of looking, and taking things apart and hauling things around. What would you expect to pay for a good clean crack free block?