I have b11 1985.
And have swapped three engines in it.
Cd20
QG15
QG18de
QG15DE IS recommended for u.
Around 70-75k including oil everything with good quality parts and aik number kaam.
And pathanun wala chal so chal swap is worth 50k and oils are additional. So around 6k for oils.
Mithu khan se hosakta hai pathanun wala swap.
And peshawar ka qamarahmad.awan can guide u.