In living-donor lobar lung transplantation (LDLLT), 2 healthy donors donate their right or left lower lobe. Whether you would or would not be a good candidate for donation depends upon the deleterious effect that the smoking has had on your lungs. Your best bet would be to contact the nearest lung transplant center and request a copy of their policy, including exclusionary factors. They may have a policy on the number of pack-years, determined by multiplying the number of packs smoked daily by the number of years smoked. There are pulmonary function tests (PFTs) criteria and they may even offer to perform the PFTs. If they don't offer the test and it is required for even initial consideration, you could arrange for PFTs through your doctor.
Good luck to you and your father.