If you're installing yourself you will want to get a factory service manual and a dial gauge indicator so you can do all the measurements required. If this is your first time assembling an engine then you may want to have someone else assemble it. It also depends on what stroker kit you bought if you just bought the rotating assembly separately. There can be clearance issues on kits larger than 392 on the bottom of the cylinder bore.
Did you order the proper piston diameter for the .020" over bore? Find out if the block is being bored/honed with a torque plate or not, the cyclinders can be out of round when torqued otherwise.