The 2.3, T-5 has a .79 overdrive. So that effectively drops RPM 20%. Most people forget but tire size is a factor too. Here are some results with a 3.40 rear and the T-5 .79 overdrive at 65 MPH:
22" tire = 2,667 RPM, 23' tire = 2,551 RPM, 24" tire = 2,444, 25" tire = 2,347 RPM, 26" tire = 2,256 RPM
With 3.00 rear and the T-5 .79 overdrive at 65MPH:
22" tire = 2,353 RPM, 23' tire = 2,251 RPM, 24" tire = 2,157, 25" tire = 2,070 RPM, 26" tire = 1,991 RPM
The 3.40 rear ratio and 26" tire is about on par with the a 3.00 rear ratio and a 23" tire. Also keep in mind lowering RPM sounds good but if you don't have the torque in the motor you are in for a long, slow rate of getting up to speed. As an alternative to the T-5 I'm of the mind set that if you are going for a long drive have a cheap set of steel wheels and very tall tires for getting there. Then swap to your nice matching set once you arrive. You might find a set cheap at a wrecking yard with decent tires for $50-$100. BTW, this is for "lugnut." I realize "flash041" does extensive travel and toting a spare set of wheels is impractical.
This is the link to the calculator I used:
https://purperformance.com/p-29669-rpm-calculator.html