personally with a tube car the chassis is all tubes fr to back side to side etc, a pan car is exactly that has the spine and pans of the original car regardless of suspension type. motor plates in my opinion are gear box mounts nothing more nothing less, just a different design to a normal solid mount kit or any other way of mounting the box. ladder bars work well and are a very simple way of doing it, cheers dean
When a car has its rear torsion tube removed the rear suspension is held together by the cage. So making it a half cage car or in the states a chapan car.
Also, the frame horns are a structural part of the chassis and they will have been cut off.
Ladder bars have an advantage over factory and are lighter and easy tune for launches