The car I got off my Gf's sister was taken to a machinest to get Pistons or valves redrilled. Now the rings don't fit or something and it leaks. Would a new Longblock fix this issue?

 

uhhh.....HWHAT ?!?! ....what is the actual issue with the motor...does it run... is it still torn down.... and yes a long block would fix any problem the current motor has because you'd be replacing the whole motor

 

valves OR pistons?
But yeah... a NEW longblock would fix the issue.