Bent valves but the surface of the pistons had indentations from the valves about a half inch from the piston rings on all pistons

I bought this car and the owner told me it might have bent valves because the timing belt snapped. I bought the car anyway hoping to replace the cylinder heads. After looking at it I did see that the valves were bent, but the surface of the pistons had indentations from the valves about a half inch from the piston rings on all pistons. Would this cause a problem in the drivability of the car? Is this a lost case or do you think I have a chance to revive the vehicle? Pistons are moving up and down the chambers with no problem. Please give me your expert advise.