Frame or chassis options for A bodies

Andy,
The biggest advantage to the aftermarket front suspension in the A-body is the room and They are designed to work with a rack and pinion steering gear, which is going to give you a modern feel to your car.

The Hotchkis and QA1 still use the recirculating gearbox , in the end for me personally , I don't like the feel of a gearbox. I have built cars with the upgraded gearboxes on them , although they feel way better than stock , still feels like an old car to me.

The aftermarket will give you way more room without the torsion bars and steering rack up front and low. If you are going with a non stock transmission , the mopars have tiny transmission tunnels and will need raised to keep the driveline angles good. Without the torsion bars the rear cross member is easier to modify.

If you are going with a stock engine and transmission and don't mind the way a gearbox feels , you may want to just modify the stock suspension.