Car title

I have a 1968 dart two door post I live in Florida I need someone to tell me how I can get a title for my car so first off
I bought the car from one of the members on here but he only had a open title for a parts car and I have put way to much money is this car to get it expounded for switching # so
I need to know how to get a title now yes I have called the dmv and they talk some other language one tells me no and the other says bring it to me with all the receipts For ever part that is not original To the car ya right
The title company out there is talking $500 to $1000 for a new title
No vin on the car dmv will not except a parcel number off rad support and it has new rear quarters on it so no number there if you can help plz let me know