dartman, the fact is....the only numbers you really need to be concerned with from the flow bench are the corrected flow numbers.

for a mildly ported J head with SBC type valves, tested on a 4" bore adapter....if you're in the 250+ cfm range(corrected flow @ 28"), you're doing pretty well.

most SB Mopar "home port" type work ive tested is usually in the 220's and 230's, although mid-240's is really pretty easy to attain, and doesnt really require much material removal....if you take it out of the right places.