I am running 3.73's in my 70 with a 28" tall tire.  I am running around 3200 RPMs at 70 MPH.  The car gets 15 MPG on the highway with a healthy 454/TH400.  I was running 4.10's in it for a few years and did alot of highway driving with it, it ran fine everytime I took it down I-95 from NJ to MD, never missed a beat.  I only replaced tghe gears because the 4.10s were whining so loud from not being setup properly by the person I got it from.
 
Tom

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