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I've never made any sense of the different flange sizes -- I've got a '75 M41 J-type from a 240, and it interchanges with my '67 D-type... same flange size. Certainly other flanges are running around out there, so get the front shaft from the donor car just in case. The driveline shop that shortens your original shaft can easily make the switch at the same time if required.
The J-type gives a .79 reduction, and the D-type a .75 reduction (the D-type drops your revs just a tad more, in other words).
The driveline is plenty strong enough if you use decent U-joints, no worries. You'll break second gear before you break the shaft (if you drive like an idiot instead of driving the fast way).
SUs, properly tuned and in good shape -- repeat: properly tuned and in good shape -- will clearly outperform the Weber DGV, also properly tuned and in good shape. I like the DGV for its low maintenance and fuel economy, and it supports up to 130 HP if you got 'em, but it's essentially a tiny carb.
DGV = one 32mm choke and one 36mm choke. Airflow has to go around a 90-degree bend and down intake runners that are two different lengths.
Dual SU HS6 = two 46mm chokes, variable venturi design, airflow gets a straight shot at the intake ports.
I don't know how there can be any argument about which inherently gives more performance, except by people that replaced worn-out and/or mistuned SUs with a new DGV and found that (no surprise) it runs better.
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