A-833 2.47 1st gear change to 3.09

BTW
the 3.09 low gear trans, is a completely different gearset. IIRC ONLY the low-gear will swap with a 2.66 box.
Furthermore from 2.66 to 3.09 is plus 16%, which is the same as from 3.23s to 3.73s, without the wide 1-2 split.
With a high-compression 360, that split is no bother. But the smaller your engine is, or the the less it's CCP, or the lower the cruizer gear, the more annoying that split gets to be. As these begin to come into play, you will find yourself revving it higher and higher in First, before shifting into Second gear, thus sounding more and more like a Mustang. and
if there's one thing I hate,
it is sounding like a Mustang.
Having said that;
my combo has run every 1x23 trans, and just about every rear gear from 2.76 to 5.13s, in search of the perfect ratios, and three different cams with various pressures from a low of 177 to a high of 195, to find the perfect combo; and I found it in 2004.
It was the Commando with the GVod, and with 3.23s.
But, my car traps better with 3.55s and the zero to sixty runs better in First-over, with 3.55s, so 3.55 is what I have run ever since.
Happy HotRodding.