First of all, thank you all for feedbacks.
Because dual vtec has better fuel consumption..? Also, the engine guy in shershah says single vtec is less available. Thats why he quoted me non vtec and dual vtec. Now i hope he knows what he is talking about when he says dual vtec, and later it doesnt turn out to be single vtec 
Yes the performance and fuel consumption parts are the reason im going for the swap. The mechanic said overhauling will bring problems in the long run.
Tap water. Well you can call it partly my mistake that I didnt fill up the water in the radiator, but I used to do it after a week or two (since my running is not very long) and didnt have to fill much when i did because water was still there. But lately, the water has been disappearing quickly, which resulted in car getting heat up and gasket developing problems. Radiator was serviced 8 months back.
I had the gasket changed (3 months back), and filled water every now and then. Then again on last Friday, I was coming back from a relative and suddenly the car would start stuttering, which is when i realized the temp needle is at 75%. I was close to home so i made it there and the car stopped itself. Then it wouldnt start. However, it started in the morning and while I topped the water in the radiator, it kept coming out, while the pipe coming from the engine to the radiator also swelled. Took it to the mechanic and he said gasket gone.
I am still driving and its driving okayish, but only on a 2-3km route.
As for the dual vtec, he said its complete with engine, wiring, and ecu. He said he will discount when i am ready to order. He will deliver himself from shershah, and has been delivering engines to the mechanic and other mechanics in the area for over 15 years.
So is 60k the reasonable price for the engine + wiring + ecu?
What about fuel tank? Will i need to change that or just add a fuel pump?
What is that?
Well for one, I am not making the most of EG with the weak carb engine, with a crappy carb. Currently im getting 6km/litre.
If I go for a better engine (which for me is the dual vtec), I expect to get better performance and some speed when i need to accelerate. Then, I get to drive on petrol only unlike now.
Secondly, the mechanic says overhauling is not best solution if you want to keep the car for yourself. I want to keep the car and would prefer to have something I can be happy with in the long run.
Yes, original is original, but everything has its life wont you agree? I know for sure I can only get the gasket changed again, fill the radiator religiously, and use this engine for many more months. I will still get that 6km/ltr mileage, not enough power, and will definitely get from A to B. However, what I seek is a little pleasure as well.
Yes, overhauling is somewhat cheaper, in the range of Rs. 35k to 40k. The last time the head was removed for changing gasket, the mechanic confirmed about pistons having play and that overhauling is required. But i was thinking, why not spend a little more and get the good stuff in if the engine has to be overhauled.
Thanks!
