Want to do suspension..

Originalowner73 340duster said
Yes stock suspension...will be doing poly and t bars will need shocks possibly springs been sitting long time road very low and didn't handle bumps at all

OK "what is" stock..............?

Is your car originally 340? Or slant? Have you measured the T bars?

Generally heavier T bars and AT LEAST a factory anit-sway bar, "go up" from there

Then good shocks, tires, bushings etc.