87 Corolla/nova BIG PROBLEM

Hey all...recently picked up an 87 nova and i have a bigggg problem. I dont have the key to the doors or gas tank...neither does the guy i bought it from. he assumed it was the same as the ignition key...WHAT SHOULD I DO??? do dealers have the keys on file by VIN? can they make me a new one? Also...what kind of trouble/cost would it be to drop a 4-age and manual tranny into this thing? any advice on either of these questions? any help is appreciated...

consult a locksmith or Chevyor Toyota dealer