Hi EvEryonE ~!~!

I was wondering . . if a stock block is used for more then 10 years (with many many Ks miles on it). . . Will the block sleeved be out of shape or wear and tear ? ? ?

Lets say if currently i have a B16A2 . . and i purchase a B16A2 with ported head and have everything balanced . . when i got it shiped, can i do the swap with all the parts except the block ? ? cos the vin no is on the block . . i dun wanna swap the block . . i just wan the ported head balanced crank shaft all that . . my question is . . if i did it like this . . will all the balancing go to waste ? ? ? ?

ThankzZ in advance for the replies