A little closure to this post. Machine shop confirmed this flywheel was neutral balanced. Decided to go ahead and tear down the motor to check it over. Surprised to find a Comp hydraulic roller cam in it. On the negative side, it has cast Sealed Power pistons and stock rods. The original post is now a moot point since I'm going to upgrade to some decent h beam rods and forged pistons. Being anal and the fact it's already apart, time to upgrade and rebalance. Guessing this engine was more of a stock rebuild and the heads and cam were added later in its life. Thanks for all of the replies.
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65 Lemans Street Car - 521, T400, 3.70 9". 10.13 @ 135. 3770 lbs. Drag Week ‘14, ‘15, ‘17
63 Lemans Race Car- 8.81 @ 151, 5.60 @ 123(SOLD)
67 Bonneville ragtop
74 Firebird - 455, e heads, TK0600 in process
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