Jordan,
Yes you are spot on about NY not issuing titles back then. For one of the cars the prior owner did manage to find the registration but the way the VIN was written on it NJ DMV would not accept it. instead of writting VIN in full the first part was written as 280SL then the last 5 digits.
The 14 step process is well described and relatively easy to follow. What takes time is having to do title searches in the surrounding states around NJ, (and each state takes its own sweet time about responding),placing an add in the local news paper stating I about to obtain title and getting 3 people to state in a notarized letter that they have seen me in possession of the car.