360 Magnum building on an existing bottom end

WoW! thanks for the info, I really appreciate it. Guess I'm going to either save a little longer for some quality proven heads, Find a good used heads someone is selling or as a last resort lower my power expectation and be satisfied with what my budget will allow. either way I am learning a low from you guys as I dig deeper into this venture and have many questions. So thanks again for your help. Funny thing is I have had the same experience with Speed master my self when I inquired of them what these heads would flow they couldn't give me an answer, even though they advertise that the heads are flowed on a flow machine. Seemed odd to me also, but they did say they were in fact 179cc intake runners. Go figure.