Assalam O Alaikum

Guys i have 93 model Prado, it has a 2L Diesel engine. Engine is too noisy, pik is considerably very poor and smooking too much while being pumped. So i wanted to Swap it with 3RZ Gasoline Engine with the Existing Manual gear. Any Suggestion about my decision. M i thinking right or not. Because some people are advising me to swap it with a 1KZ diesel engine. plz give me ur Suggestions guyz.\

What is the mileage of 1KZ and 3Rz. please also share ur experiences...