After your vital and valuable suggestions i decided that indeed 1kz is too big for the poor sportage. As i wanted to get rid of diesel i went for toyota 3S. I did take guarantee from the mech and the engine providor for any faults whatsoever particularly the ignition wires. I got the complete deal done in 12 days with matchless performance now. Doing 10km/ltr in city with a freezing AC. bad points are that at low rpm of the engine when clutch is disengaged the vehvibrates a bit but i solved the problem by increasing the idling to 1000 rpm. apart from that no problems, infact faster than many cars and i feel i have lost some grip as the veh has become lighter and much much faster and quieter.
I got it done from an old man named Kala Khan, located adjacent to the caltex pump on Sh Faisal adjacent to the bridde turning toward kala pull. His contact no is 03222475080 and got all the wiring done by bashir electrician at the same place, his no is 03002423862.
I just went one day with Kala khan to Sher Shah, selected the engine and paid the engine guy Rs 1000 as advance. The engine got delivered to mech the next day and i left my veh there too. i just picked up the vehicle on the 12th day alongwith the reciept of the engine and paid the balance money. Sold the old engine to the same engine guy.
During my visits to the mech i saw a vigo get a 1kz, a pajero get a v-twin parado 3400cc and a wrangler get the same 3S engine swapped alongwith my vehicle. the guy never bothered me and got all the work done, namely suspension, gear plate (behind the engine housing), foundations, elec connections, power steering, radiator, AC, and all other misc stuff. So far I am really happy with the performance.
Problem part is the cost. I got the 3S engine for 55k in exchange for my sportage engine although other engine and similar 3S engine were also available for cheaper rates but the problem was one condition of the stuff and secondly solid guarantte.
The mech, suspension, gear, oil sump modification, AC, silencer, elec and the misc cost me around 40k. But the job is superb ad flawless. Ill post the pic of the engine shortly.