Boss, u r restoring your fx in a good time. Use the condenser and components used in efi mehran. it will cost around 20-25k with everything. Put a good fan on the radiator it will result good.
The ac in new mehran is very nice and it gives chilled cooling. the only reason the car doesnt remain cool is because of the poor heat shields on the floor, roof, and the engine firewall. Another thing is that it has so many small gaps and crevices in the doors and body frame which let air enters and let the cooling escapes.
You are restoring everything, make sure to use proper heat insulation, close extra holes and reduce gaps because the car is at stage where anything can be corrected.