Depends what you want, everyone and or project can be different. A lot of built street engines are gonna fall in the 0.9-1.3 hp per cid, 273 = 245-355hp, 318 = 285-415hp, 360 = 325-470hp, there's a lot of overlap, some might want a more wild (say 350 hp) some might want 350hp done super mildly...