difference between MP vs SS 002's/003" springs

Thank you guys for the explanation of differences. My 67 Barracuda is a street car that might see an occasional 1/4 on very rare occasions as new 1/4's and paint and sticky tires with gravel lanes in the pits at Mason Dixon drag way don't mix. The reason I asked is I actually bought a set of MP springs and the guy didn't strap/ziptie/or band them together from Cali to WV so I only received one spring. #269 so I am on the fence to spend another $250 or so on another #268. But being the 002's/003's are not for street use I guess the MP springs will be on it:).

Sireland I am roughly 3hrs East of you in Martinsburg. You know the armpit of WV. If not for the great job I have in Hagerstown MD and my elderly parents living here I would move to Morgantown:)