IMO, you've already removed that possibility with the top end choice. The cam is what I'd define as mid-size when used in a 4" stroke street/strip engine with properly matched heads (in the 250-280cfm at .500, and 200-220cc port volume). The W9's volume should be 260-270. Some really oversimplified basics: the stroke increase is about 12% over a 360, and 21% over a 340. The W9 port volume is 230% or more larger than the RPM's 171ccs (around 240cfm at .500), which are slightly larger than the factory X/J/etc heads. The huge port and plenum volume will mean very poor idle quality and mandate a higher than "normal" idle speed, and poor off idle/low rpm response. Again, you cannot "get", without some "give". I think you've gone so "racey" on the heads, no small cam is going to help. You have to open the valves far enough and for long enough for the port to work. The larger the volume, the more airflow is required to make the whole system (like the carb) work efficiently. For efficiency at lower speeds (idle to 5500) the head ports have to work at low and mid range lifts. This is much more critical than any peak flow figures. Which is why I say I don't feel any cam be spec'd until the full flow figures are known and reviewed.