69 GS 400 stage 1

What were the differences between the gs400 and the gs400 stage in 69?

 

Hotter cam, stiffer valve springs, Q jet reworked, distributor and timing settings, beefed up TH400 with different shift points.
The valve size remained the same, not bigger like the 70455 stage1.
Higher oil pressure spring and 5/8 inch pick up tube.
I believe 2 1/4 exhaust.
Standard 3.64 posi, and I think in 69 3.42 posi with AC
Chrome valve covers.
I don't know about the extra frame torque box like on the 70 Stage1 and big bowl fuel pump??

 

Did they have a larger radiator and fan? And larger fuel lines?

 

All the readings say extra heavy duty cooling with larger radiator but I believe it's also upgraded with a clutch fan.