There are a couple other threads in this forum, concerning the handling qualities of these vehicles.
Yours is a Ford, with a Twin-I-Beam front suspension. Driving a vehicle with a Twin-I-Beam suspension has always been thought of a herding more than steering.
When the bushings are in good shape, the ride height is set properly, and the alignment is correct, it should drive just fine. Sometimes a rear sway bar can help, or a stiffer front sway bar, or stiffer springs, or all of the above. Does the suspension feel mushy when you steer back-and-forth? If so, this is an indicator that you may benefit from one of the above changes.
If you have new tires on it, make sure they are at or near their max pressure. Given the weight of these B's, the tires should be Load Range E, and an "E" tire usually has a 80psi max pressure. Check the sidewall of the tire, to verify all this info.