I'm going to go through my front and rear suspensions on my 67 convertible small block, shocks, springs, bushings etc. I see lots of posts by guys using different spring combos and cutting springs etc. What about just using the stock replacement parts? Is there some dissadvantage to using stock delco parts? If so what are the problems. Right now the car has air shocks in the rear and what looks like adjustable gabriel shocks up front. If I replace with the stockers will the car have the correct stance or was there a problem with the original setup?

Also, are the polygraphite bushings better for ride quality or will original rubbers work just as well?

I am about to start on mine when it gets a little cooler down here. I am no expert but as I understand it the stock springs will ride higher than most people like. I am trying to get the top of the tire to sit at the top of the wheel well. Stock springs will put you an inch or two higher than that. I think the lower stance will improve handling. Also, the original springs had a load of about 260 for the Malibu and 320 for the SS which is a bit light for handling.
The poly/rubber issue is another whole can of worms. Poly handles better but may squeak. Rubber won't squeak, may ride a bit smoother but won't corner as well. Depends on what you are doing with your car. Hope this helps.

Thanks, that answers a few questions for me. I was wondering why the stock springs were ditched for this setup of air in the rear and adjustables in the front. The car stands perfect now but all the bushing are dry rotted and in need of replacement. I figured as long as verythings apart why not replace springs and shocks. When the car was new was the stance a problem for people or did it look and ride well?

Poly handles better but may squeak. Rubber won't squeak, may ride a bit smoother but won't corner as well.Poly doesn't necessarily handle better... Poly offers less deflection, which will make the car usually handle better, BUT Poly in the rear upper control arms can cause binding (just the upper rear arms), actually making the rearend too stiff, causing the tires to lose contact in corners...

I rebuilt my suspension and added all poly bushings, the car handled better than stock, but did squeak and was extremely stiff in the rearend. When cornering, small bumps in the road would cause the car to almost "skip" sideways. Not enough to cause me to crash, but not a good feeling.

I recently switched the rear suspension to new rubber bushings on the top arms, and Global West arms for the lowers...

Huge difference in ride quality and stability on corners.

All the front suspension, wheels/tires/shocks/springs remained the same...

So I think Poly is great for all locations except those upper rear arms. Maybe an Edelbrock or Currie upper arm (with the articulating joint) would be much better. I think I will try those next year.