I have 64 2dr with post. Does this add or take away from the value?

Probably takes away from the value -- because it's a lower trim level (not a Malibu) and you can't clone an SS out of it. It is rarer though.

My 67 is a post sedan, and you'll find several here people here that have them and like them.

Biggest downside - not as many resto parts are available.
Biggest upside -- less like that some past hot rodder has made all sorts of modifications and thrown away original parts.

I'm one of the people Zeke mentioned, I prefer 2 dr sedans. They make nice understated performance cars.....
:thumbsup: