thats where the block heas least wear as towards the top it has more wear due to engine firing at the top of the block and forcing the piston against the block at the the top, it`ll be fine once ran in!
put no.1/4 pistons right down the bottom and dip you hand in oil and rub it round the bores, same again on 2/3 and it`ll be free`er promise!

Sean (never gave bad advice yet lol)