I certainly would not put all V twins in the "antiquated" basket> Take for example the Vincent top speed wise it would run rings around any stock Harley produced today. Ducati is another fine example of high tec.
Harley introduced a Drag Bike on the Australian market (not intended for road use).It was $65,000 and you could get any number of Jap 750's for less than a third of the price that would burn them over the quarter mile. They did not sell too many. As has been mentioned you should not have to spend money on a new Harley to get it to run properly. Those parts should come with standard bike.