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Bob,
I have to say that NASCAR Bearings are a complete mystery to me and I am more than happy to take advice on this subject.
I have contacted Vandervell Racing Bearings about their Copper/Lead Race Bearings but the investment may be too high.
I agree with you comments about counterweights and the CAD model shows a rod weight of about 550 gms for the H beam and the I beam isn't finished yet.
I think that the 10cmg maximum imbalance relates to an ISO 1940 G1.5 - ish classification which would be extremely good as most car cranks tend to run at around G40 so balance shouldn't be much of an issue.
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