that return spring i believe is under the dash attached to the pedal. i have a return spring on my bellhousing but it isn't hooked up to anything, i noticed it the other day, but didnt think anything of it.
the spring under the dash that you are thinking of is the overcenter spring. The clutch pedal return spring is attached to the fork on one end and the bellhousing on the other. I have no overcenter spring since technically i dont need one with the diaphram clutch, but i also dont have the return spring from the fork to the bell since i have a blowproof and im not sure what would work and where to hook one up (or if i even need one now)