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I don't know what the "base " is. I helped a friend change the rear main seal on a 57 Tbird while the engine was still in the car. Easier with the neophrene seal. Lubing the seal before tightening up is very important.
After dropping the pan, you need to unbolt or loosen the main caps to lower the crank a little to slide the seal in the upper (block)portion. Follow the instructions about offsetting the seal
The rope seal can be done in the same manner I suppose. There is a gadget that grabs the seal so it can be pulled around the crank (don't remember the name of it).
Proper installation of the side seals is very important.