whats the chances that a pt cruiser will run good after timing belt went off. checked the heads and pistons and there is no damage? will it be ok after installing new timing belt and water pump.

so not so long ago, my timing belt on my
2001 pt cruiser went out. luckily my wife
wasnt going fast maybe speed limit under
25mph.car didnt want to start so my
mechanic told me it was the timing belt.
hes charging me $450 parts and labor. but
my concern is will the car run good after
the new timing belt goes in and water
pump. mechanic said he check the heads
and pistons are ok. there was no damage
what so ever. whats the chances it will be
ok.