my car was 8/27/67..but its orig pie tin was gone... i have never seen an early survivor 383-s or GTS to see when the pie tin cut off date could be! i bet it was with in a few weeks [so mid august latest]... got any pics of early SPD survivors?
I have an earlier GTS (shipped from factory 2/27/67) and you can see the pie tin in my photo gallery pic of the engine. It's a replacement but I have the orignial which is identical.