Not throw a wrench in the debate, but I do not think that the 3H code indicates the "Sprint" option.(OHC 6 w/4bbl, Rocker emblems, etc.)Contrary to this sites info. My 85,000 mile original "Sprint" convertible that was built the last week of March, does not have the 3H designation. In fact there is no 3 codes period. I have supporting PHS and dealer paperwork for it. I also have a "Sprint" hardtop parts car that was built the 2nd week of Feb and it too does not have a 3H or 3 series code.