All 1970 solid lifter-(Holley carb.equipped),engined vehicles that were built with w/RPO NA-9-(Calif. emissions) used the same 4 nipple charcoal cannister..part#7028024.
Stant caps produced on odd days were stamped w/the "S" left to right,on even days,up & down..Some purists have been caught spinning the rivit to fit their cars actual assembly day. I couldn't resist.
Gas cap is sold...Thank You Carl.