Bus...Welcome to the site. Here is a link to the 70 Yenko Deuce vin list.
https://www.yenko.net/ubbthreads/ubbt...LIST#Post72575
They are pretty much the only LT1 Novas built so unless your Dad has a one off type car he is probably mistaken.Pics of the engine stampings etc would help us sort it out for you. There are #'s stamped on the block just below the alternator.