Ansar bhai if the seller is willing to take 20-25k then its a good buy.
This car restored with the right drivetrain would be worth upwards of $10k-$15k US.
outside Pakistan.
Now before I get hammered about the price from used car market pundits, Let me give you an example. there was a 1973 RA28 recently sold for 16K un-restored. The new buyer sold me the original drivetrain with was rebuilt at the cost of $3500
and is replacing with a 1uz. ( not a good idea in my opnion).
Take this information with grain of salt and please dont take on this project with the hopes of
making a quick profit.
Ask anyone who has done this sort of project and they will tell me thats its a tough one to say the least.
Best Regards