I think it is pretty straight forward to get a B or even a C to handle decently. As several have mentioned, step up the sway bars a lot, the T bars a little (or leave alone) and good shocks. Disc brakes up front with at least the 11.75" OE type rotor.

You also need to get the alignment dialed in with some negative camber and positive caster. Often this means at least offset bushings (or tubular UCA's).

The car - whatever it turns out to be - would likely do OK in your application with available 15" radial tires. 17" or 18" could add more tire options, more feel and higher limits but not required.

A basic front end rebuild with all or mostly all rubber bushings and a Firm Feel PS box is also important.

As far as power, that depends on taste and budget. I would want at least a moderately built 360 personally for a heavier car. For your application, I don't think you want a rough idle or engine that is touchy in traffic so more cubic inches help with good manners + power.