V sad news and event but must have saved you from something worse.
Did Farooq confirm that the heat caused the Piston Slap (assuming)? This looks like alot of damage to be done by overheating only but do discuss and share his opinion on it.
Discuss the option of going 1hd 12 valve as it might save you money and might have been the original engine offered in your model. Whatever you decide, don't rush to a conclusion.
Best of Luck & Inn Shaa Allah Khair!