90 Cougar 3.8 V6 Engine Balanceing Questions

Had my engine rebuilt after aprox 160,000 miles. It blew a head gasket & had a cracked head. The engine seems to have to original pep but has a slight vibration issue. the idle is not as smoothe as when I got the
car. The shop used a "NAPA ENGINE REBUILD KIT" , New pistons,etc and a new or rebuilt head. Was thinking 'bout getting a major tuneup from a ford dealer including new ignition wiring,rotor cap, fuel injector serviceing;etc. Also curious about engine balenceing.
Question: Does the engine need to be removed for the car to be balanced?
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The engine needs to be *disassembled* to be balanced.
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