Just happened to stumble across this ebay auction for someone to date stamp your shocks for you for $75. Ad mentions clearly for one shock but seller later added price is to stamp all 4 shocks.
http://cgi.ebay.com/ebaymotors/CAMARO-CHEVELLE-NOVA-SPIRAL-SHOCKS-DATED-67-68-69-70-71_W0QQcmdZViewItemQQcategoryZ34200QQitemZ19009808 4589QQrdZ1
Had not noticed this one before!

thats stupid. a restamp is just that a restamp or should i say fake. why waste your money on that?