There is no reason you would have to.
Very little, if any at all. The carburetor is not what makes the horse power, The rotateing system and Valve train is what makes HP.
You have to replace the distributor assembly.You have to replace the distributor assembly.
you will need to replace the intake with an intake for a carburetor,install carburetor and replace the distributor with one which has a vacuum advance(a late 70's 305 or 350 will work well). you will also have to install an electric fuel pump for a carburetor (lower pressure than the fuel injecton). remove the relay powering the pump in the tank if the whole wiring harness is not removed.
If there is leaking around the base of the distributor, and you will need to replace the seal. The distributor oil seal is a paper gasket or rubber O-ring, and the distributor is removed to replace either one if the seal is leaking. It is easy to change, just remove distributor and change the seal.
The camshaft sensor is located in the distributor. I believe you have to replace the hole distributor.
replace the distributor
Only if the wires are bad.
Because you need to change the gas filter in the carburetor and you need to change the rotor and distributor. I did and the backfiring went away. Now it runs great
Yea, the crankshaft sensor is under the distributor and the camshaft sensor is inside the distributor, you cannot change it so you will have to replace the whole distributor.
You have to buy and replace the entire distributor.
It does not have a carburetor.
you must remove the distributor, disassemble unit and replace pick up coil