Just keep the car as simple as possible.
The car needs a lot of cleaning both the engine room and the interior. the interior should be like you room as u live in:).
The roof cloth needs correction. dont change it in-fact get it repaired or re-pasted by some interior guy who knows proper work.
Lower the height from backside as it is not in its original height.
as you have mentioned that it is kept with car and it is evident from the pictures, there is no need for swap.
Get rid of this bloody cng because it is cheap in short runs but its damn expensive in longer runs because it damages everything from battery to engine. Enjoy ur life by using this beauty on petrol and avoid mechanic hassles.
as for the fuel pump, check the following:
Your car fuel lines maybe choked due to lesser usage on petrol. check it, if needs cleaning then clean them of replace them.
Check all the fuel rubber lines and hoses connected. they become hard with the passage of time, replace them because they give hard time for the fuel pump to suck fuel from tank.
The fuel pump should get proper current and it should be mounted properly away from engine heat (Chinese pump dies because of heat also).
search for the original new fuel pump also. check for the vacuum lines of the carburetor also if they are properly connected or not.
as for the power steering, i believe its steering is much better than the pathetic cultus, so i suggest stick with manual steering. if still u want it then go for HPS (hydraulic power steering) as its parts of later model can be swapped easily and can be found in pindi.
dont go for EPS as it will require lots of cutting and welding.