Ya know, ya get what ya pay for. If it's cheap then it's cheap. My opinion, which is worth what it cost, if you want a big motor then it's S&S, for a 103 or smaller it's Harley. Probably the best hot rod motors are hand assembled from a combination of parts from those 2 and aftermarket suppliers. A motor is never any better than the guy that put it together. If going fast is the main consideration then for around 9 grand you can buy a used Hayabusa that will do 9s and last.