cruising speed on stock drivetrain?

[danheit]

Guys, I know this has probably been beaten into the ground, but I wasn't really able to come up with anything using the search function, so here is my question:

In my 55 Task Force with the 235 cid and the 4speed trans and stock rear axle, not clipped, completely stock all the way down to the brakes, what is a reasonable expectation for cruising speeds with this setup? I don't plan on any interstate cruising, but am wondering if I can get by with my current setup for a while with just jutting around town, or if it will soon be time to start looking for a newer drivetrain. What should I expect speed wise from this truck?