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A friend that builds race transmissions made a few gear charts for the 4 speed and came to the conclusion that the 8:39 was so close to what he considered a good custom gear set up for street use it was cheaper to go with the r&p.
I would also think (just my .02) that if you went with a short 1-2-3, or 2-3 and kept the stock 4th you would have a significant rpm drop that would drop you out of the power band.
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Harold
'79 930/DP935 (sold)
'68 VW 3.3 Turbo Crewcab
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