PennDot has been, and is getting more, crazy on this issue. You may get several different answers, even from Harrisburg. I suspect you may have to title it as a reconstructed vehicle (bad). Whatever you do:
1. Don't invest any time or money in this project until there is a clear title or at least you know what to do.
2. Save each and every receipt for anything you purchase, trade, or get from Aunt Hilda for Christmas. The state wants to make damn sure they get their tax money on the project.
3.Do not send anything about titling directly to the DMV. The best method is to take your forms,receipts and money (having made copies of EVERYTHING) to your local state representative. They will take it to Harrisburg for you and, please believe me, they will get way less hassle and faster service than you could possibly get.
4. Document every call you make to Harrisburg;time, who you talked to,etc.
5. You can get the proper forms, once determined, from AAA.
6. The state DVM laws are online, but not necessarily every update.
Good luck and please keep us posted.