good luck erik there is alot i could say about this but i am to whip from working all day on customers engines in short you know what someone needs by talking to the customers . there are the basic numbers to run down like rpms. low speed rpm top rpms and cr and what fuel there willing to buy for it. there is alot they want.you see here i said is want not what the need for hp. how much do they have to spend .bottom line is they all want 500+HP for less then 2500.