maybe should add i'm planning on front disc conversion and have stock spindles, but wouldnt hesitate to change them out if need to

you can swap/cut the coils but this will generally give you a harsher ride and not have as much up travel in the suspension before you hit the bump stops

if you use a lowering spindle you retain the stock ride quality but might run into clearance issues with the lower control arm and the rim (depends on the wheel diameter)

if you have a credit card with lots of room left go air ride,best of all worlds

OR   install some low low profile tires   

Are you looking at lowering front & rear? Or just the front?  Cutting part or all of a coil out of the front springs is doable - but I don't think that will work on the rear of 1967 and newer A-bodies because (if I remember correctly) they have a pig tail both top & bottom.

I hadn't heard about the wheel-to-control arm clearance issue with drop spindles mentioned by 2plus2 - I need to look into that.

Here's a pretty good article on lowering a car...
http://www.superchevy.com/how-to/47055-suspension-lowering-guide/

Do it right  and Bag it    

 

 

 

http://www.jegs.com/p/Ridetech/Ridetech-1964-72-Chevelle-GTO-Cutlass-Skylark-Air-Suspension-System/1197919/10002/-1

Would like to lower front 2 inches and rear 1 inch and run 17 or 18 inch wheels. will be small block. I am ordering a disc brake upgrade so thought i'd get a 2" drop spindle with 13 " rotors and 1" lowering spring in rear. Although I like the suggestion to use lowering springs all around. Just looking for the way with the least problems and fairly easy on the wallet. ( if there is one)