Diputado

Hey folks, bought a '65 "Frankenstang" with a moderately-built 289 about a year back and have since been fixing/changing/improving tons of stuff with this car. I actually have 2 questions here. First...this week while replacing the clutch and pressure plate, I discovered that the flywheel is a 164-tooth 28 oz. imbalance unit with a casting number of C9ZE-6380-B. According to everything I've read, this flywheel is off a '69-70 Boss 302. Plus....although its running a Duraspark II ignition, the actual part number on the distributor shaft is C9ZF-12131-A, which also appears to be from a Boss 302. Anyone have a idea as to whether these are actually Boss 302 parts?

Now..here's where it gets weirder....the harmonic balancer is a 50-oz imbalance with a E4-TE-A3A part number. But the engine runs smooth with no noticeable vibration, so I'm baffled as to how it was balanced with the mix of 28 and 50 oz parts?