you can just send the crank in and have it turned and balanced.

if it were me, id have the block honed but not bored (bore it and those PR3's wont fit right), have the crank turned and have the top of the block checked for plane. chances are, it is okay but better safe than sorry.

and if you dont have PR3 pistons yet, let me know i have a 3 set i will sell you cheap.