SS/B and SS/A Chassis and Suspension

NHRA Drag Rules 1972, TIRES: May use any rear wheel/tire combination that will fit into the original wheel wells. Internal wheel-well modifications are allowed; however external fender alternations are not permitted.
These are the same rules as for 1971, and for 1972 this is added (my remark)

Minor movement inboard of shock and spring mounts is allowed.

As I see it 1972 may have been the year when leaf spring were moved in under frame rail ...

So what was the national record for these Super Stockers in 1971?

I´ll try look it up, but may be someone know...