Some douche (the previous owner) heated up the rear coils on my C10 to lower it. I'd like to return it to it's stock height (or close to it). I considered using coil "helpers". Does anyone have any suggestions or direct feedback about any of those things?

If I decide to replace the springs, would it be better to go with the constant or variable style? Aside from occasionally having to haul my 750cc motorcycle, I won't be carrying much of significant weight.

Thanks in advance!

'64 C10 Long/Fleet, 230ci w/4 on the floor