The classic C10 was built for hauling, not cornering. The factory sway bars (or lack thereof on some trucks) leave a lot to be desired for spirited driving. Upgrading the front and rear sway bars dramatically reduces body roll and transforms how the truck handles in corners.
This thread covers sway bar diameter selection, polyurethane vs rubber end links and bushings, and front vs rear bar priorities. We also discuss what to expect in terms of handling improvement vs ride quality tradeoffs.
Already tackled your suspension drop? The Pomya Lowering Kit for 1963-1972 C10 pairs well with sway bar upgrades for a complete handling package.
What sway bar setup are you running on your classic truck?