1964 Buick Skylark

1964 Buick Skylark 2door hardtop. We bought this car from an estate and the plates are from 2003. It has been in a barn since that time. 
We put it on the lift and everything underneath appears to be solid other than the rear body mounts have some rot. 
Engine is not original and it’s either a 350 or 327. 
We got it started but engine has a knock and that is as far as we have taken it. Either spend a weekend and swap the engine or rebuild it. 
This is a very solid and original car. The price is $7995 plus tax  in 46901 
For anymore questions and some more pics please ask.