A lightened center balanced cfrank, and heads that weigh more than factory castings... And some re-engineering to get long valves and decent springs in them. Win win? LOL.
It's pretty easy math: 2.3hp/cfm given the racey stuff. What do they flow at .600?
Sometimes an expensive crank is cheaper than a broken block. Earlier i mentioned the EQs might go 280 cfm maxed out. Mine flowed 272 at .600 with 2.02s and a bowl port.