That is probably the best "retro conversion" I have seen on a modern car.

There is a 68 Mustang "kit" on an 05 Mustang around here and its just terrible, it looks like a bloated 68.

There is also a 53 corvette kit on a C5 chassis and its not near as bad as the mustang but it just isn't right. You can look at it and clearly see both corvettes lol.