Take trick flow there probably out flowing 318 heads by .150" lift and at .399" lift flowing a least 100 cfm more sure it's only got a 240 degrees to do it, question is another 40-80 degrees of time gonna make up for the terrible flow of the 318 head, which be lucky under these conditions to make 325 hp, I'd say trick flow and stock cam could easily match and probably do more.