Need gear ratio advice.

Not enough info

1--What are your street tires going to be and how tall are they?

2--What are your expectations for cruise speeds? Mileage?

3--What RPM would you "like to see" and at what speed?

For my present situation, I'm running 28" rear tires and 3.89 (Ford). This is about as low as I'd want to be for 65 mph travel, and even that is "short trips." Over 3K at 65 mph

26" tires is gonna be a lot worse, 3.90 x 26":