The way I figure, the tq peak on the 273 motor the cam came from was 1600rpm. I have a few more cubes. I think relistically it should peak about the same but make a few more pounds when just running on the primaries. I do have headers and a 4bbl so it might make turn a little higher but not much and only when the secondaries are open (very rarely during cruising). Right now going 75 I am turning over 2500 so I don't think an OD will hurt me, it should drop me right around 1750. The headers are staying because this car is eventually destined for a 500hp 416 stroker after a few months of this experiment