They had dyno graphs in the loose leaf Shelby American Parts and Accessories catalog which came originally in a folder. Pages were then inserted in the parts catalog rack. One side had engine description and graph. On the back page was complete specifications.
For example:
289 Cobra High-Rev Racing Engine
PART NUMBER: S1CR-6003-6
SHIPPING WEIGHT: 530 lbs.
Net brake horsepower (hp): 395 @ 7000 rpm
Net maximum torque (ft.-165*): 330 @ 4100 rpm
Weight, complete: 477 lbs.
Fuel System:
Carburetor type: Four 2-V Weber 48 IDA-1
Carburetor number: S1CS-9513
Main metering jet indentification: Main meter 150, Air correction 130
Fuel pump static pressure: 4-6 psi @ 500 rpm
* as printed - a typo