383 or 5.7 hemi

I love my hemi swap, wouldn't do my car any other way. But my car was a pos. If you are resourceful, you can make the hemi affordable, but it does cost money and take some patience to do it economically. On a nice original car I would say big block because there is a lot of "massaging" to get the hemi in, especially with the 545 trans. Either way, cool car, I love notchbacks!