The Marches are a nightmare! Chris and Dan have developed a good handle on many of them but it's the toughest subject to organise.
I think the connection between, say, the 73B and the 74B is stronger than between the 742 and the 74B. In other words, a '74B' was more likely to be an earlier 'B' updated than a 742 converted. So I think the way you have them at the moment is probably best.
We may be able to split the 722 out at some later point as it was that year's FB/Atlantic car and also the F2 car. And there were nearly 50 of them!!
Allen
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