Since finding new rear gears that fit in the original rear is almost impossible, I decided it was easier and cheaper to replace the entire rear axle. I found a good rear axle from a 1969 Chevelle and installed 3.73:1 gears to give me the road speed I was looking for. The track width is about 1/2 inch narrower than the original rear, but it fits perfectly. I also has the standard Chevy 5-lug hubs, so I'll be able to use 4 wheels that look the same.
After accounting for the new transmission and rear gear ratios, first gear is now geared almost exactly like it was before, but top speed in overdrive is now around 88 MPH. I can comfortably cruise down the highway at 65 for 70 with plenty of power for the hills.
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