Thinking about 4.10's

Hi everyone. I have a 70 dart with a 340 and a A500 (42rh) OD trans. I have been playing with the rpm calculator and with my 25" tires and a final drive of .69 at 65 mph, rpm sit at 2400.

I know I will eventually step up to a 27" tire,which drops the rpm to 2200. My question is that too low?

My cam is a 340 stock replacement with a duration of [email protected] on a 110 LSA, with an operating range of 1500-5500 rpm.

The intended use for the car is a fun driver.