Same question! I think you must decide what you want. As a guy who stayed with the 6 in my 65 Nova SS, it depends on what you plan to do with the car. Mine is basically for show, so having a V-8 isn't a big deal; but many people thumb their noses at a lowly 6. This was my first true restoration and I felt like going all the way! With all the muscle cars out there and beautiful tri5's the 6's don't get too many nods. If you plan to cruise and drive this a lot, the V-8 is probably the better choice. If you want to be a purist, say with the 6.