Front Coil Spring Noise?

[tomfg]

On my 64, 1/2 ton, When going slow, over bumps, or while sometimes cornering, I hear a "clunk". It sounds like it may be coming from
the left front suspension coil spring, but I'm not 100% sure.
The front end is all tight, with new ball joints and tie rods,
and recently had a front end alignment.

Are these trucks known for noisy springs, or should
I be looking for something wrong?
The front of the truck sits level, so It's I shouldn't have
a broken spring, although I did replace the back springs
as one of those were cracked.

Any ideas? Thanks.