Read through the suspension section of this (Mustangs Plus)...
http://www.mustangsplus.com/catalog/suspension_09.pdf
They have the coil springs for several Fords all on the same page including your Comet and it appears that they share the same part numbers.
If your car originally had a 6 cyl - you should get the V8 springs. That will help quite a bit, but if you can take it to the next step get the V8 front sway bar if they are available for Comets (they gotta be!) and that will really help with the roll. Some springs will lower the original ride height so becareful you get what you want and if you have old 6cyl springs now, when you go to V8 springs you'll see a big difference in the height of the front of the car and you may have to look into replacing the rear springs.
__________________
Ride On,
Noel
"I'll fix it or break it, Guaranteed!"
My Garage - 67 Mustang Coupe, 67 GTO, 67 Sprite, 72 Chevy PU, & Old Ford 8N.