Should I install a sway bar?

[Sam.Patch]

I am the third owner of a 1972 Chevy C10, base motor is the 307 V8, I have now installed a Chevy target master 350 V8. Except for the engine, engine components, and an aftermarket exhaust system, this truck is stock. I have no desire to lower the truck, I plan to continue to use this to haul things and short drives around town. This thing starts up quickly in all weather, and heats up quickly, so it is great to drive around in the winter. It gets parked when temperatures get up in the 90's, as my truck does not have air conditioning!

(I remember driving in all weather in the 1960's and 70's in 1950's vehicles that did not have A/C, and I had no idea how miserable I was )

I am in the process of rebuilding the front suspension, and I noticed, this thing does not have a sway bar. I looked at the lower control arms and found these holes which could be for sway bar mount brackets:



and on the frame are what could be mounting holes for sway bar frame brackets:



I wonder what bracket comes with an oval hole. Maybe the oval was for towing?

Based on a little research on this site, these trucks did not necessarily come with sway bars.

So, should I install a sway bar, what are the benefits? Should I just leave it alone?