Internal or External Balance?

I ordered pn DCC-4529110 from summit, and I don't have the old box (oops). My old flywheel had been resurfaced already and had hundreds of stress cracks on the clutch side that couldn't be removed. There was no vibration before with the old flywheel. If I don't see anything loose after jacking the car back up in the air then maybe I'll have to take the old flywheel to the shop along with the new one and have the new wheel balanced to match the old, or am I heading down a slippery slope?