This thread is going to be hell
. There is alot of "racing" engines in the market with very good prices that can hold their on with engines doble the price. I can tell you of what I know,
Werks B6
with a 2013 or 2057 pipe. Italian made, very well done and is 225.00usd. I'm not saying that the Novas are not good or even alphas they all are very good engine, the longetivity of a engine falls in the hand of the user not much in the engine my opinion, Good luck with your serch and this thread lol. Forgot, the B6 is exclusive made for buggys, The B5 is very good for truggys with the same pipes.