Stock weight distribution for various body styles - can you improve balance w/out drastic mods?

That's about where my '67 notch has scaled as well - maybe a little more % on the nose.
I've weighed it on the return road scales, as well as on race scales like Steve shows above.
Not quite as much aluminum as Steve's car; copper radiator, iron heads, brake master.
And my wheels and tires are probably smaller and lighter.

The fastback designs including the Duster put more weight on the back. You can look at the Car Life and other magazine reports from the time to see the range of weights and distribution. Sometimes they printed test weights, especially later in the 60s.

Later models will be a little heavier due to the side impact protection built into the doors.