Definitely go with a gear swap.Assuming you have a TH400 behind that BB 3,73 might be
a little steep for highway use,depending on what tire you are using.3.08 with a 28 inch
tire had me around 2600 at 70.If you are running a tall tire like 31.50's,you could go to
a wider lower profile tire simulating a gear change.Next I would do a cam swap,biggest
bang for the buck in my opinion