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On my old 1976 280 Z I had it geared to do 30-60-90-120-150 at 6 k in each gear. At first it was even taller geared with a .75 OD and a 3.54 differential. I think it went 85 MPH in 5th at 3k RPM. I switched it to a 3.90 which gave me the listed speeds in gear. 2nd gear maxed out at 60 MPH which was good for 0-60 times and the car would get close to 30 MPG at 65 MPH.
I always was an advocate of having the large step between 4th and 5th gears. That way you have the performance of a fairly close ratio 4 speed with the highway mileage of the much taller 5th gear.
Compared to that the VX gearing gave me 120 in 3rd gear compared to 120 in 4th with my old Z car.
Like Pale suggested you not have the option of using your previous P&G strategy, which should be your starting point (as close as possible) while refining your strategy using the availability of much taller highway speed gearing. Should be lots of fun and higher average speeds may actually be on of the solutions if you feel it is necessary.
regards
Mech
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