Did you put the 350 in? If so do you still have the original engine? You're not the first to face this hurdle. This happens a lot. Your state DMV will be able to tell you if the engine number was used pre '56. If it was, all states have a method of resolving the engine change without re-titling conundrum. You'll just have to work with them & jump through a few hoops.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.