If you really want an oem spec car, look for one in KPK or Punjab, You won't find one in KHI. Also, these cars are very prone to rust, combined that with local cheap bodywork, look to spend alot on the body if you want to do it the right way. Parts are very expensive now. For mechanical parts, you can only find replica parts now. I remember back in 2001 or something, I was looking for a brand new mechanical fuel pump for my 4K and I couldn't find it anywhere. mind you these cars were still popular back then.
Also, rust with these cars is eminent no matter what you do. I know knowledgeable people who have had to sell theirs after spending a fortune, just because the rust would re-appear. I would advise to look for another car, like an 80s-90s Honda or something that still has some sort of parts support, and is initially made better. Older Corollas were tin cans.