Kamran,
Good job, looking nice. I'm sure it feels good to have it back. A few observations, I hope you don't mind me pointing out;
Head light rings, dash plate & rear bumpers need to be body color and not chrome. Not looking good man. The front bumber towing shackles go the other way around, so that they rest on the bumber, rather than the grill (check my single one in the pic above). Put in a dust boot cover for your gear lever. I know there's one down below, but cover the opening. You can put in an axle boot & that looks and works fine. The yellow things, is that yellow grease or paint ?
As for the carbs, the Carry/ Highroof ones are with the least bit of mods. They have return lines. You can also check before buying. The potohar one does not have a return line and need to be installed. I have had the Potohar & the Carry ones both, I did not feel any difference, other than that on my pocket. Infact i'm not happy with the Potohar carb's functionality.
Datsun 1500 is a down draft carb & supposidly was widely used as replacement to the original. I'm going to refurbish the original one again and put that back on.