a seal on top of the core support
yep, the car already has this
. The later small block Nova A/C suit cases would be the same as a 69 big block the only difference they are brown instead of a black grey texture
this is interesting, wonder what the reasoning was behind this, reduction of parts inventory, one part instead of two? Makes sense, why have a "small block" version, when the "big block" version would serve both requirements.