Re: gearing
I have a T5 with the 0.72 overdrive gear, a 230ci engine, and a 3.73 rear diff. in my 1965 short bed. It drives just fine and the highway RPMs are in the 2100 range. I have 235/75R15 tires which are 28.8" tall.
If you swap to a 3.08 rear I think you will be pretty happy. Then I f you decide later to install a T5, the best option would be to find one with a 0.86 overdrive to match the 3.08. . If you go straight for the T5 swap, then get one with the 0.72 overdrive gear to match up well with a 3.73 or 3.90 rear. The 3.42 rear will tend to bog the 230ci if you have a 0.72.
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