distributor disassembly in car

I agree with the previous comments, plus I don't think you can even do it because you have to drive out the pin in the lower shaft in order to pull the shaft and have decent access to the springs. I bet you can't even see the springs in the distributor while it's in the car, unless you lay out on your belly over the engine. All distributor work is much much easier on a well-lit bench.

In order to replace the distributor correctly, you need to create two reference points. One, mark the base and the block surface so you can align the distributor body correctly. Two, note the orientation of the rotor, so it is facing the right direction when you reinsert it. If you do this precisely you won't even have to set the timing again.