Assalam-0-alikum warehmat ALLAH

Respected All.. need suggestions as i want to swap Engine in 87 Corolla..

1. Which Engine (fix Bolt to Bolt w/o alteration)
2. Gear is 4 Fwd should I change the gearbox to 5 fwd along with engine or leave it as it is.
3. Go for EFI or Carburetor one.
4. What is the fee for documentation to get engine number change on book in Karachi.

Waiting for your precious comments jazak ALLAH